100 Shell Programs Part II

100 Shell Programs in Unix
by Sarika Jain and Shivani Jain Laxmi Publications. (c) 2009. Copying Prohibited.
Reprinted for N Kodanda Ramudu, Cognizant Technology Solutions NadipiPothappaGari.KodandaRamudu@cognizant.com Reprinted with permission as a subscription benefit of Skillport, http://skillport.books24x7.com/
All rights reserved. Reproduction and/or distribution in whole or in part in electronic,paper or other forms without written permission is prohibited.
100ShellProgramsinUnix
Part II: Programs

Overview 1. Write a shell script to find whether an input integer is even or odd. $vi prg1 clear echo "enter a number" read x y='expr $x % 2' if test $y -eq 0 then echo "Number is even" else echo "Number is odd" fi Sample Run
$sh prg1 enter a number 11 Number is odd $sh prg1 enter a number 12 Number is even
2. Write a shell script to find out the greatest among three inputs. $vi prg2 clear echo "enter the value of a b c" read a read b read c if test $a -gt $b -a $a -gt $c then echo "a is greatest" else if test $b -gt $c then echo "b is greatest" else echo "c is greatest" fi fi Sample Run
$sh prg2 Enter the value 23 33 34 c is greatest $sh prg2 enter the value 23 55
of
of
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44 b is greatest $sh prg2 enter the value 78 33 44 a is greatest
of
3. Write a shell script to calculate the net salary of an employee in a particular month considering various allowances (TA, DA, HRA) and deductions (INCOME TAX, PROVIDEND FUND) as: a. TA=15 percent of basic salary b. DA=2 percent of basic salary c. HRA=10 percent of basic salary d. INCOME TAX=5 percent of salary e. PROVIDEND FUND=10 percent of salary $vi prg3 clear echo "enter basic salary" read bs hra='echo $bs \* 10 / 100 | bc' ta='echo $bs \* 15 / 100 | bc' da='echo $bs \* 2 / 100 | bc' tax='echo $bs \* 5 / 100 | bc' pf='echo $bs \* 10 / 100 | bc' add='echo $hra + $ta + $da | bc' ded='echo $tax + $pf | bc' netsal='echo $bs + $add - $ded | bc' echo echo net salary is $netsal Sample Run
$sh prg3 enter basic salary 2240 net salary is 2540
4. A departmental store announces its festival scheme to customers on cash payment. The scheme is as followsa. If purchase amount is less than 1000 then Tax=2% and discount=10%. b. If purchase amount is greater than 1000 then Tax=5 % and discount=20%. $vi prg4 clear echo "enter purchase amount" read pa if [ $pa -lt 1000 ] then tax='echo $pa \* 2 /100 discount='echo $pa \* 10 else tax='echo $pa \* 5 /100 discount='echo $pa \* 20 fi
| / | /
bc' 100 bc' 100
bc'
bc'
amount='expr $pa + $tax echo cash payment =$amount Sample Run

$sh prg4 enter purchase amount 3000 cash payment =2550
$discount'
5. Write a shell script to perform an arithmetic operation upon two inputs. The operation should also be input by the user. $vi prg5 clear echo "enter a and b" read a read b echo "enter operation to be performed" read op case $op in +) c='expr $a + $b' ;; -) c='expr $a - $b' ;; /) c='expr $a / $b' ;; \*) c='expr $a \* $b' ;; *) echo "no valid operation specified" ;; esac echo Result after performing operation on a and echo $c Sample Run
$sh prg5 enter a and b 4 3 enter operation to be + Result after performing 7 $sh prg5 enter a and b 6 5 enter operation to be Result after performing 1 $sh prg5 enter a and b 2 3 enter operation to be * Result after performing 6 $sh prg5 enter a and b 4 2 enter operation to be / Result after performing
is
performed operation on a and b is
2 $sh prg5 enter a and b 4 5 enter operation to f no valid operation
be
performed
specified
6. Write a shell script to find out the length of an input string. $vi prg6 clear echo "enter string" read str len='echo $str | wc -c' len='expr $len - 1' echo "length of string = Sample Run
$sh prg6 enter string unix length of string
$len"
7. Write a shell script to find whether an input year is leap year or not. $vi prg7 clear echo "enter year" read y k='expr $y % 4' if test $k -eq 0 then echo "leap year" else echo "not a leap fi Sample Run
$sh prg7 enter year 2008 leap year $sh prg7 enter year 2009 not a leap
year"
year
8. Make a duplicate copy of a specified file through command-line. $vi prg8 clear echo file to be copied : $1 echo new file name : $2 if test $# -lt 2 -o $# -gt 2 then echo invalid exit
fi cp $1 $2 echo copy successful Sample Run

$sh prg8 a1.txt a1.out file to be copied : a1.txt new file name : a1.out copy successful
9. Write a shell script to concatenate two strings input by the user. $vi prg9 clear echo "enter two string read str1 read str2 str3='echo $str1 $str2' echo After concatenate : $str3 Sample Run
$sh prg9 enter two string Shell Programming After concatenate : Shell
Programming
10. Write a shell script to concatenate files. $vi prg10 clear cat>f1 cat>f2 cat f1 f2 >f3 cat f3 11. Program for command-line parameter & special variable. $ vi prg11 clear echo the name of the program is $0 echo the first parameter : $1 echo the second parameter : $2 echo the number of parameters are : $# echo the parameters are : $* Sample Run
$sh the the the the the prg11 a s d f g name of the program is prg11 first parameter : a second parameter : s number of parameters are : 5 parameters are : a s d f g
12. Generate a table of an input integer.
$vi prg12 clear echo "input number :" read x echo for i in 1 2 3 4 5 6 7 8 9 10 do t='expr $x \* $i' echo $t i='expr $i + 1' done Sample Run
$sh prg12
input number
4 8 12 16 20 24 28 32 36 40
13. Write a shell script to print all the multiplication tables (up to 10) between two given numbers. $vi prg13 cleari=1 j=10 echo enter lower limit read low echo enter higher limit read high while test $low -le $high do echo echo Table of $low is echo while test $i -le $j do k='expr $low \* $i' echo $low \* $i = $k i='expr $i + 1' done i=1 low='expr $low + 1' done Sample Run
$sh prg13 enter lower limit 2 enter higher limit 4 Table of 2 is
2 * 1 = 2 2 * 2 = 4 2 * 3 = 6 2 * 4 = 8 2 * 5 = 10 2 * 6 = 12 2 * 7 = 14 2 * 8 = 16 2 * 9 = 18 2 * 10 = 20 Table of 3 is 3 * 1 = 3 3 * 2 = 6 3 * 3 = 9 3 * 4 = 12 3 * 5 = 15 3 * 6 = 18 3 * 7 = 21 3 * 8 = 24 3 * 9 = 27 3 * 10 = 30 Table of 4 is 4 * 1 = 4 4 * 2 = 8 4 * 3 = 12 4 * 4 = 16 4 * 5 = 20 4 * 6 = 24 4 * 7 = 28 4 * 8 = 32 4 * 9 = 36 4 * 10 = 40
14. Write a shell script to find out the ny, where n and y must be input by the user. $vi prg14 clear echo "enter a number" read n echo "enter the power read y i=1 j=$n while test $i -lt $y do j='expr $j \* $n' i='expr $i + 1' done echo $j Sample Run
$sh prg14 enter a number 4 enter the power 2 16
15. Write a shell script to find out the factorial of an input. $vi prg15 clear i=1
j=1 echo "enter the number" read num while test $i -le $num do k='expr $i \* $j' i='expr $i + 1' j=$k done echo Factorial of $num is $j Sample Run
$sh prg15 enter the number 4 Factorial of 4 is 24
16. Write a shell script to generate the series of even number from 0 to n. 0 2 4.....n $vi prg16 clear echo "enter value of n" read n i=0 while test $i -le $n do printf " $i" i='expr $i + 2' done echo Sample Run
$sh prg16 enter value of n 5 0 2 4
17. Write a shell script to check whether an input is a prime or not. $vi prg17 clear echo "enter number" read num i=2 while test $i -lt $num do k='expr $num / $i' if test $k -eq 0 then echo "number is not prime" exit fi i='expr $i + 1' done echo "number is prime" Sample Run
$sh prg17 enter number 4number is not prime $sh prg17 enter number 7 number is prime
18. Write a shell script to generate the primes between two given numbers. $vi prg18 clear echo "enter two numbers" read a echo if [ $a -eq 0 -a $a -eq 1 ] then a=2 fi read b echowhile test $a -le $b do i=2 while test $i -lt $a do k='expr $a % $i' if test $k -eq 0 then break fi i='expr $i + 1' done if [ $i -eq $a ] then echo $a fi a='expr $a + 1' done Sample Run
$sh prg18 enter two numbers 22 2 3 5 7 11 13 17 19
19. Write a shell script to find out the sum of series 1+2+3+.n, where n is input by the user. $vi prg19 clear echo "enter value of n" read n i=1 sum=0 while test $i -le $n
do sum='expr $sum + $i' i='expr $i + 1' done echo Sum of series is $sum Sample Run
$sh prg19 enter value of n 12 Sum of series is 78
20. Write a shell script to generate the series 2,4,6,8,n, where n must be input by the user. $vi prg20 clear echo enter value of n read n echo i=2 while test $i -lt $n do printf " $i, " i='expr $i + 2' done printf " $i" echo Sample Run
$sh prg20 enter value of n 21 2, 4, 6, 8, 10, 12, 14, 16, 18, 20
21. Write a shell script to generate the series 1, 5, 2, 10, 3, 15,.50. $vi prg21 clear a=1 b=5 while [ $b -le 50 ] do printf " $a" printf ", $b" a='expr $a + 1' b='expr $b + 5' done echo Sample Run
$sh prg21 1, 5, 2, 10, 3, 15, 4, 20, 5, 25, 6, 30, 7, 35, 8, 40, 9, 45, 10, 50
22. Write a shell script to generate the series 1+1/2+1/3+#+1/n. $vi prg22
clear echo enter value of n read n echo i=2 printf "1+" while test $i -lt $n do printf "1/$i+" i='expr $i + 1' done printf "1/$i" echo Sample Run
$sh prg22 enter value of n 12 1+1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10+1/11+1/12
23. Writeashellscripttogeneratetheseries+2/3+3/4+n-1/n. $vi prg23 clear echo enter value of n read n echo b=1 c=2 a=1 n='expr $n - 1' while test $a -lt $n do printf $b/$c+ b='expr $b + 1' c='expr $c + 1' a='expr $a + 1' done printf $b/$c echo Sample Run
$sh prg23 enter value of n 12 1/2+2/3+3/4+4/5+5/6+6/7+7/8+8/9+9/10+10/11+11/12
24. Write a shell script to find out the sum of series 12+22+32+#n2. $vi prg24 clear echo "enter value of n" read n i=1 sum=0 while test $i -le $n do k='expr $i \* $i'
sum='expr $sum + $k' i='expr $i + 1' done echo Sum of series is $sum Sample Run
$sh prg24 enter value of n 10 Sum of series is 385
25. The XYZ construction company plans to give a 5% year-end bonus to each of its employees earning Rs. 5,000 or more per year and a fixed bonus of Rs 250 to all other employees. Print the bonus of any employee. $vi prg25 clear echo Enter Salary of an Employee read sal if [ $sal -ge 5000 ] then bonus='echo $sal \* .05 | bc' else bonus=250 fi echo bonus is: $bonus Sample Run
$sh prg25 Enter Salary of an Employee 6500 bonus is: 325.00 $sh prg25 Enter Salary of an Employee 7000 bonus is: 350.00 $sh prg25 Enter Salary of an Employee 3500 bonus is: 250
26. Write a shell script to find out greatest among n input integers where n is to be input by the user. $vi prg26 clear echo "Enter number of integers" read n echo "enter value of integer number 1" read j i=2 while test $i -le $n do echo enter value of integer number $i read k if [ $j -lt $k ] then j=$k fi i='expr $i + 1'
done echo Greatest input is $j Sample Run

$sh prg26 Enter number of integers 5 enter value of integer number 8 enter value of integer number 3 enter value of integer number 22 enter value of integer number 44 enter value of integer number 11 Greatest input is 44
1 2 3 4 5
27. Write a shell script to read an integer and print its digits in reverse order. $vi prg27 clear echo "enter any integer" read num b=0 while test $num -gt 0 do a='expr $num % 10' b='expr $ $b + $a $ \* 10' num='expr $num / 10' done b='expr $b / 10' echo reverse=$b Sample Run
$sh prg27 enter any integer 123 reverse=321
28. Sort the given numbers in the given order, i.e., either in ascending or descending order. $vi prg28 Clear ans=y while test $ans = y do echo Enter no. of elements to be sorted read no echo Enter $no elements i=1 rm sort1 while test $i -le $no do read n 'echo $n >> sort1' i='expr $i + 1' done
clear echo input order of sorting echo 1.Ascending echo 2.Descending echo enter choice read ch clear case $ch in 1) sort -n sort1>file1 echo Inputted elements in Ascending order: cat file1 ;; 1) sort -r sort1>file1 echo Inputted elements in Descending order: cat file1 ;; 1) echo "Invalid Input" ;; esac echo continue.y/n read ans done Sample Run
$sh prg28 Enter no. of elements to be sorted 4 Enter 4 elements 3 5 2 1 input order of sorting 1.Ascending Press 1 2.Descending Press 2 enter choice 1 Inputted elements in Ascending order: 1 2 3 5 continue.y/n y Enter no. of elements to be sorted 5 Enter 5 elements 4 6 1 3 3 input order ofsorting 1.Ascending Press 1 2.Descending Press 2 enter choice 2 Inputted elements in Descending order: 6 4 3 3 1 continue.y/n n
29. Write a shell script to compare two strings input by the user for equality.
$vi prg29 clear echo enter string1 read str1 echo enter string2 read str2 if test $str1 = $str2 then echo strings are equal else echo strings are not equal fi Sample Run
$sh prg29 enter string1 abc enter string2 abc strings are equal $sh prg29 enter string1 xyz enter string2 abc strings are not equal
30. Write a shell script to print the characters of an input string into reverse order. $vi prg30 clear echo enter any string read str len='echo $str | wc c' len='expr $len 1' while test $len ne 0 do i='echo $str | cut -c $len' a=$a$i len='expr $len - 1' done echo reverse is $a Sample Run
$sh prg30 enter any string programming reverse is gnimmargorp
31. Write a shell script to tell whether input string is palindrome or not. $vi prg31 clear echo enter any string read str len='echo $str | wc -c' len='expr $len -1' while test $len -ne 0
do i='echo $str | cut -c $len' a=$a$i len='expr $len -1' done if test $str = $a then echo String is Palindrome else echo String is not Palindrome fi Sample Run
$sh prg31 enter any cmc String is $sh prg31 enter any abc String is
string Palindrome string not Palindrome
32. Write a shell script to find out the location of an input character into an input string. $vi prg32 clear echo enter any string read str echo enter character read c len='echo $str | wc -c' len='expr $len - 1' i=1 while test $i -le $len do a='echo $str | cut -c $i' if test $a = $c then echo Position=$i fi i='expr $i + 1' done Sample Run
$sh prg32 enter any string Programming enter character g Position=4 Position=11
33. Write a shell script to count the number of characters, words, spaces in a given text. $vi prg33 clear echo "enter text" read t w='expr $t | wc -w'
c='expr $t | wc -c' c='expr $c - 1' s='expr $w - 1' echo characters = $c echo words = $w echo spaces = $s Sample Run
$sh prg33 enter text that is a table characters = 15 words = 4 spaces = 3
34. Write a shell script to print Fibonacci series. $vi prg34 clear echo enter the last element of series read n echo a=0 b=1 echo $a echo $b i=1 while test $i -lt $n do c='expr $a + $b' if test $c -gt $n then exit fi echo $c a=$b b=$c done Sample Run
$sh prg34 enter value of series 5 0 1 1 2 3 5
35. Write a shell script to translate the contents of a file into UPPER CASE, where file name is entered through command line. $vi prg35 clear if test $# -eq 0 then echo "No argument" exit
fi while test $# -gt 0 do if test 's $1 then if test -f $1 then cat $1 | tr a-z A-Z <$1.up cat $1.up fi else echo $1 is not a file fi shift done echo Translation successful Sample Run
$sh prg35 file.txt WELCOME HELLO Translation successful In file.txt, welcome and hello are written in small letters. After running this program, welcome and hello are converted in capital letters and saved in 1.up file
36. Write a shell script to perform following tasksa. Display the present working directory. b. Clear the screen. c. Display the current date. d. Make a directory with its -directory d1. e. Change the directory to the directory having sub directory d1. f. Create two files (say file1 & file2) within this. g. Provide appropriate security options to these files. h. List the contents of directory. $vi prg36 (a) (b) (c) (d)
(e) (f) (g) (h)
Pwd clear date mkdir cd d mkdir cd d1 touch chmod ls
d d1 file1 file2 644 file1 file2
37. The marks obtained by a student in five different subjects are input through the keyboard. The student gets a division as per the following rules. (Using else's clause). if percentage greater than or equal to 60 get First division if percentage greater than or equal to 50 or less than 60 get Second division
if percentage greater than or equal to 40 or less than 50 get Third division if percentage less than 40 Fail $vi prg37 clear echo enter marks of five subjects (out of 100 each) read m1 read m2 read m3 read m4 read m5 per='echo $ $m1 + $m2 + $m3 + $m4 + $m5 $ /5 | bc' echo echo Percentage is $per if [ $per -ge 60 ] then echo First division else if [ $per -ge 50 -a -$per -lt 60 ] then echo Second division else if [ $per -ge 40 -a $per -lt 50 ] then echo Third division else echo Fail fi fi fi Sample Run $sh prg37 enter marks of five subjects 44 67 80 90 67 Percentage is 69 First division $sh prg37 enter marks of five subjects 56 54 53 51 60 Percentage is 54 Second division $sh prg37 enter marks of five subjects 46 54 41 42 46 Percentage is 45 Third division $sh prg37 enter marks of five subjects 34
42 31 32 23 Percentage is 32 Fail 38. The marks obtained by a student in two different subjects are input through the keyboard. The student gets a division as per the following rules. (Using elif clause). if percentage greater than or equal to 60 get First division if percentage greater than or equal to 50 or less than 60 get Second division if percentage greater than or equal to 40 or less than 50 get Third division if percentage less than 40 Fail $vi prg38 clear echo enter marks of five subjects read m1 read m2 read m3 read m4 read m5 per='echo $ $m1 + $m2 + $m3 + $m4 + $m5 $ /5 | bc' echo echo Percentage is $per if [ $per -ge 60 ] then echo First division elif [ $per -ge 50 -a -$per -lt 60 ] then echo Second division elif [ $per -ge 40 a $per -lt 50 ] then echo Third division else echo Fail fi Sample Run
$sh prg38 enter marks of five subjects 44 67 80 90 67 Percentage is 69 First division $sh prg38 enter marks of five subjects 56 54 53 51 60 Percentage is 54 Second division $sh prg38 enter marks of five subjects
46 54 41 42 46 Percentage is 45 Third division $sh prg38 enter marks of five subjects 34 42 31 32 23 Percentage is 32 Fail
39. Write a shell script to generate first 'n' terms of the following sequence without using multiplication-1 2 4 8 16 32n. $vi prg39 clear echo enter the value of n read n echo i=1 while test $i -le $n do echo $i i='expr $i + $i' done Sample Run
$sh p39 enter the value of n 20 1 2 4 8 16
40. Write a shell script to find greatest common divisor (GCD) for two given numbers. $vi prg40 clear echo enter numbers a and b read a b while [ 1 ] # infinite loop do c='expr $a % $b' if [ $c -eq 0 ] then echo GCD = $b exit fi a=$b b=$c done Sample Run
$sh prg40 enter numbers a and b 47 3 GCD = 1
41. Write a shell script that takes as command-line input, a number n and a word. It then prints the word n times, one word per line. $vi prg41 clear i=1 while [ $i -le $1 ] do echo $2 i='expr $i + 1' done Sample Run
$sh prg41 5 Hello Hello Hello Hello Hello Hello
42. Write a shell script to remove all words that occur more than once in a list. $vi prg42 clear echo enter list cat <file1 echo uniques are : sort -u file1>file1.out cat file1.out Sample Run
$sh prg42 enter list a c a b c Uniques are : a b c
43. Write a shell script to take backup of all c files. $vi prg43 clear ls abc >a1 if test - a1 then mkdir abc cp *.c /abc echo backup is done fi
44. Write a program in UNIX to accept range of months and display calendar within that range. $vi prg44 clear echo enter lower limit read llimit echo enter upper limit read ulimit echo enter year read y echo while test $llimit -le $ulimit do cal $llimit $y llimit='expr $llimit + 1' done Sample Run
$sh prg44 enter lower limit 2 enter upper limit 3 enter year 2008 February 2008 Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 March 2008 Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
45. Write a program in UNIX to accept a year and months in that year and display calendar of those months. $vi prg45 clear echo enter month value in numeric read m echo enter year read y echo for i in $m do cal $i $y done Sample Run
$sh prg45 enter month value in numeric 1 3 12
enter year 2008 January 2008 Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 March 2008 Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 December Tu We Th 2 3 4 9 10 11 16 17 18 23 24 25 30 31 2008 Fr Sa 5 6 12 13 19 20 26 27
Su Mo 1 7 8 14 15 21 22 28 29
46. To find out the sum of squares of integers from m to n where m, n are input by user. $vi prg46 clear echo enter value of m and n read m read n echo s=0 while [ $m -le $n ] do a='expr $m \* $m' s='expr $s + $a' m='expr $m + 1' done echo $s Sample Run
$sh prg46 enter value of m and n 2 5 54
47. To find out the greatest and smallest element of an array. $ vi prg47 clear echo Enter read no i=0 echo echo Enter while [ $i do read
size of array
$no elements -lt $no ] n[$i]
i='expr $i + 1' done high=${n[0]} low=${n[0]} k=1 while [ $k -lt $no ] do if [ $high -lt ${n[$k]} ] then high=${n[$k]} fi if [ $low -gt ${n[$k]} ] then low=${n[$k]} fi k='expr $k + 1' done echo highest=$high echo lowest=$low Sample Run
$sh prg47 Enter size of array 5 Enter 5 elements 3 22 1 55 4 highest=55 lowest=1
48. Write a shell script to find out whether a file is writable or not. File name must be input by the user through command-line. $vi prg48 clear if test -w $1 then echo file is writable else echo file is not writable fi Sample Run
$sh prg48 a1.txt file is writable
49. Write a program for Bubble sorting. $vi prg49 clear echo enter any no read no i=0 k=0 while [ $i -lt $no ]
do read n[$i] i='expr $i + 1' done while [ $k -lt $no ] do j=0 while test $j -lt $no do if test ${n[$k]} -lt ${n[$j]} then m=${n[$k]} n[$k]=${n[$j]} n[$j]=$m fi j='expr $j + 1' done k='expr $k + 1' done a=0 echo Array after bubble sort while test $a -lt $no do echo "${n[$a]}" a='expr $a + 1' done Sample Run
$sh prg49 enter any no 5 6 4 1 9 7 Array after bubble sort 1 4 6 7 9
50. Write a shell script to find out what type of character you have entered such as capital letter, small letter, digit, special symbol and whether you entered more than one character. $vi prg50 clear echo enter character read char case $char in [A-Z]) echo you entered a capital letter;; [a-z]) echo you entered a small letter;; [0-9]) echo you entered a digit;; ?) echo you entered a special symbol;; *) echo you entered more than one character;; esac Sample Run
$sh prg50
enter character a you entered a small letter enter character 1 you entered a digit enter character # you entered a special symbol enter character asd123 you entered more than one character enter character A you entered a capital letter
51. Write a script that has this output: Give me a U! U Give me a N! N Give me a I! I Give me a X! X $vi prg51 clear for i in U N I X do echo Give me a $i! echo $i done Sample Run $sh prg51 Give me a U! U Give me a N! N Give me a I! I Give me a X! X 52. Rewrite the Q. 51 so that it uses command-line input to provide the spell out letters. $sh prg52 Clear for i do echo Give me a $i! echo $i done Sample Run
sh prg52 BOOK Give me a B! B Give me a O! O Give me a O!
O Give me a K! K
53. Write a shell script that presents a multiple-choice question, gets the user's answer, and reports back whether the answer is right, wrong, or not one of the choices. $vi prg53 clear echo UNIX is echo a\) a Turkish Assistant Manager\'s club echo b\) a United Nations organization echo c\) a computer operating system echo d\) all of the above read answer case $answer in a) echo Wrong the answer is c;; b) echo Wrong the answer is c;; d) echo Wrong the answer is c;; c) echo Right;; *) echo Not one of the choices;; esac Sample Run
$sh prg53 UNIX is a) a Turkish Assistant Manager's club b) a United Nations organization c) a computer operating system d) all of the above a Wrong the answer is c) $sh prg53 UNIX is a) a Turkish Assistant Manager's club b) United Nations organization c) computer operating system d) all of the above c Right
54. Write a shell script which accepts the word oak as an answer regardless of whether upper-case or lowercase letters are used anywhere in the word. $sh prg54 clear echo What kind of tree bears acorns\? read response case $response in Oo) echo $response is correct;; Aa) echo $response is correct;; Kk) echo $response is correct;; *) echo sorry, that is wrong esac Sample Run
$sh prg54 What kind of tree bears acorns? Aa Aa is correct
$sh prg54 What kind of tree bears acorns? AA sorry, that is wrong
55. Write a shell script that takes a login name (say X) as a command-line argument and reports to you when that person has logged in or not. If the user wants to send a greeting to that person (X) redirection can be used to his or her terminal. (Such a script would be run in background.) In case admin is not login, it repeatedly says "admin is not logged in" press ctrl+c $vi prg55 clear until who | grep $1 > /dev/null do echo sleep now echo admin is not logged in echo press ctrl+c sleep 300 done set 'who | grep $1' echo $1 has logged in on $2 echo hi, $1 > /dev/$2 Sample Run
$sh prg55 tomcat here tomcat is the user name who is to be searched for being log in. If tomcat is not log in then the set command returns error. tomcat has logged in on tty1 [tomcat@localhost ~]$ hi, tomcat This output is displayed on tomcat's terminal $sh prg55 admin sleep now admin is not logged in press ctrl+c
56. Write a shell script that takes a command-line argument and reports whether it is a directory, a file, or something else. $vi prg56 clear for name do if test -d $name then echo $name is a directory elif test -f $name then echo $name is a file else echo I don\'t know what $name is fi done Sample Run
$sh prg56 mnt mnt is a directory $sh prg56 emp.dat
emp.dat is a file
57. Write a shell script that asks for the capital of India and repeats the question until the user gets it right. Enter capital in small letters. $vi prg57 clear echo What is the capital of India read ans while test $ans != delhi do echo No, that\'s not it. Try again. read ans done echo That is correct. Sample Run
$sh prg57 What is the capital of India delhi That is correct. $sh prg57 What is the capital of India mumbai No, that's not it. Try again.
58. Write a number-guessing script so that it uses a numeric comparison. It tells whether an incorrect guess is high or low. $vi prg58 clear echo I\'m thinking of a number between 1 and 50. echo Guess it and earn my approval. read guess until test $guess -eq 33 do if test $guess -gt 33 then echo Too high! Guess again. else echo Too low! Guess again. fi read guess done echo Well done! Sample Run
$sh prg58 I'm thinking of a number between 1 and 50. Guess it and earn my approval. 10 Too low! Guess again. 20 Too low! Guess again. 25 Too low! Guess again. 30 Too low! Guess again. 35 Too high! Guess again.
40 Too high! Guess again. 50 Too high! Guess again. 32 Too low! Guess again. 33 Well done!
59. Write a shell script that accepts the user into the Wheeler Club if his or her weight is less than 80 pounds or more than 250 pounds. $vi prg59 clear echo Greetings., What is your weight\? read weight if test $weight -lt 80 -o $weight -gt 250 then echo Welcome to the Wheeler Club! else echo You must work to further distinguish yourself. fi Sample Run
$sh prg59 Greetings., What is your weight? 55 Welcome to the Wheeler Club! $sh prg59 Greetings., What is your weight? 70 Welcome to the Wheeler Club! $sh prg59 Greetings., What is your weight? 90 You must work to furtherdistinguish yourself. $sh prg59 Greetings., What is your weight? 270 Welcome to the Wheeler Club!
60. How will you copy a file "abc.doc" present in current directory to a directory "abc2" present in the parent directory? Steps$mkdir abc1 $mkdir abc2 $cd abc1 $touch abc.doc $cp abc.doc ../abc2 To check file is copied or not $cd $ls abc Output is abc.doc 61. Write a shell script to search a file in current directory. $vi prg61 clear
echo Enter a file name to search read fn Is | grep $fn>/dev/null if [$? -eq 0] then echo The file $fn is present in the current directory. else echo The file $fn is not present in the current directory. fi Sample Run
$sh prg61 Enter a file name to search abc.doc The file abc.doc is not present in the current directory. $sh prg61 Enter a file name to search a The file a is present in the current directory.
62. Write a shell script to display a three digit number in English words. $vi prg62 clear echo Enter the three digit Number read num a='expr $num % 10' b='expr $num / 10' c='expr $b % 10' d='expr $b / 10' set $d $c $a for arg in $* do case $arg in 1) echo One ;; 2) echo Two ;; 3) echo Three ;; 4) echo Four ;; 5) echo Five ;; 6) echo Six ;; 7) echo Seven ;; 8) echo Eight ;; 9) echo Nine ;; 0) echo Zero ;; esac done Sample Run
$sh prg62 Enter the three digit Number 123 One Two Three
63. To find number of files in Present Working Directory. $vi prg63 clear
echo Present Working Directory is: pwd # to display the present working directory echo Number of files is: pwd | ls |wc -l Sample Run
$sh prg63 Present Working Directory is: /root Number of files is: 8
64. To display distance in different units. $vi prg64 clear echo Input distance in kilometers read a met='expr $a \* 1000' cm='expr $met \* 100' inch='echo $cm / 2.54 | bc' feet='echo $inch / 12 |bc' echo The distance in meters is $met meters echo The distance in centimeters is $cm cm echo The distance in inches is $inch inches echo The distance in feets is $feet feets Sample Run
$sh prg64 Input distance in kilometers 2 The distance in meters is 2000 meters The distance in centimeters is 200000 cm The distance in inches is 787401 inches The distance in feets is 65616 feets
65. To display date and time in different formats by using positional parameters. $vi prg65 clear #Date in desired format set 'date' #Setting positional parameters through date command echo $3 $2 $6 echo $4 echo $2 $3 $6 echo $2 $6 $3 Sample Run
$sh prg65 30 Apr 2008 16:51:58 Apr 30 2008 Apr 2008 30
66. Moving shell files from PWD to specified directory. $vi prg66
if [ $# -lt 1 ] then echo Improper Usage : $0 Pathname fi mv *.sh $1 echo All files are moved in the $1 directory ls $1 Sample Run
$sh prg66 abc All files are moved in the abc directory a.sh b.sh $sh prg66 Improper Usage : p1 Pathname
67. To print all the files and total number of files in given directory. $vi prg67 clear if [ $# -lt 1 ] then echo Improper Usage : $0 pathname fi oldifs=$ifs ifs=/ for arg in $* do if [ -d $arg ] then cd $arg echo Present directory echo $arg echo Files in the directory : ls echo total number of files in this directory : echo 'ls | wc -w' else if [ -f $arg ] then echo $arg is a file exit fi fi done ifs=$oldifs Sample Run
$sh prg67 Improper Usage : p1 pathname $sh prg67 /root Present directory /root Files in the directory : a aaa.c abc2 b c ddd ddd1 Desktop p1 total files in this directory : 9 $sh prg67 abc abc is a file exit
68. To sort strings. $vi prg68 clear echo Type string 1. cat >> srt1 echo Type string 2. cat>> str2 echo Type string 3. cat>> str3 echo sorted strings are sort str1 str2 str 3 Sample Run
$sh prg68 Type string 1. abc Type string 2. xyz Type string 3. mnop sorted strings are abc mnop xyz
69. To find binary equivalent of a decimal number. $vi prg69 clear echo Enter a number read a pow=1 sol=0 while [ $a -gt 0 ] do x='expr $a % 2' inter='expr $x \* $pow' sol='expr $sol + $inter' pow='expr $pow \* 10' a='expr $a / 2' done echo $sol Sample Run
$sh prg69 enter a number 12 1100 $sh prg69 Enter a number 102 1100110 $sh prg69 Enter a number 2984 101110101000
70. To calculate simple interest.
$vi prg70 #Calculate a simple interest clear echo Enter values of Principle, Time (in yrs), and rate read p n r si='expr $p \* $n \* $r / 100' echo Simple Interest=Rs. $si Sample Run
$sh prg70 Enter values of Principle, Time (in yrs), and rate 2500 3 25 Simple Interest=Rs. 1875
71. If the sides of a triangle are denoted by a, b and c then area of the triangle is given by area = Square root of (s(s-a)(s-b)(s-c)) where, s = (a+b+c)/2 $vi prg71 clear echo Enter sides of a triangle read a b c s='expr $ $a + $b + $c $ / 2' area='expr $ $s \* \( $s - $a $ \* $ $s - $b $ \* $ $s - $c $ \)' area='echo sqrt $ $area $ | bc' echo Area of the triangle is $area Sample Run
$sh prg71 Enter sides of a triangle 60 70 50 Area of the triangle is 1469
72. Program to display system date in format MM/DD/YY & system time in format hrs:mins:secs. $vi prg72 clear echo The current system date in required format is : date +%D echo The current system time in required format is : date +%T Sample Run
$sh prg72 The current 04/05/08 The current 10:26:47
system date in required format is : // Means 5th April 2008 system time in required format is : // Means 10 hrs 26 mins 47 secs
73. Program to say hello to the user. $vi prg73 clear echo Enter your Name read name
echo Hello $name Sample Run

$sh prg73 Enter your Name Charles Babbage Hello Charles Babbage Enter your Name Dennis Ritchie Hello Dennis Ritchie
74. Program to display a message using switch case. $vi prg74 clear echo Enter a number between 1 and 3 read num case $num in 1) echo You have Entered 1 ;; 2) echo You have Entered 2 ;; 3) echo You have Entered 3 ;; *) echo Please enter some value between 1 & 3 ;; esac Sample Run
$sh prg74 Enter a number between 1 and 3 3 You have Entered 3 $sh prg74 Enter a number between 1 and 3 2 You have Entered 2
75. Write a menu driven program which has following option(a) Factorial of a number (b) Prime or not (c) Odd or even (d) Exit $vi prg75 Clear ch=y while test do echo echo echo echo echo read case
$ch = 'y' a. Factorial b. Primeor not c. Odd or even d. Exit Enter choice ch $ch in a) echo Enter number read num i=1 j=1
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while test $i -le $num do k='expr $i \* $j' i='expr $i + 1' j=$k done echo Factorial of $num is $j ;; b) echo Enter number read num i=2 while test $i -lt $num do k='expr $num % $i' if test $k -eq 0 then echo number is not prime break fi i='expr $i + 1' done if test $i -eq $num then echo number is prime ;; fi ;; c) echo enter number read num y='expr $num % 2' if test $y -eq 0 then echo number is even else echo number is odd fi ;; d) exit ;; *) echo wrong choice ;; esac echo Do you want to continue press y/n read $ch done Sample Run
$sh prg75 a. Factorial b. Prime or not c. Odd or even d. Exit Enter choice a Enter number 4 Factorial of 4 is 24 Do you want to continue press y/n Y a. Factorial b. Prime or not c. Odd or even d. Exit Enter choice b Enter number 6 number isnot prime
Do you wantto continuepress y/n y a. Factorial b. Prime or not c. Odd or even d. Exit Enter choice b Enter number 7 number is prime Do you want to continue press y/n y a. Factorial b. Prime or not c. Odd or even d. Exit Enter choice c enter number 5 number is odd Do you want to continue press y/n y a. Factorial b. Prime or not c. Odd or even d. Exit Enter choice c enter number 12 number is even Do you want to continue press y/n y a. Factorial b. Prime or not c. Odd or even d. Exit Enter choice 2 wrong choice Do you want to continue press y/n y a. Factorial b. Prime or not c. Odd or even d. Exit Enter choice d
76. Program for printing user id of user whose uid >50. $vi prg76 clear cat /etc/passwd | cut -f3 -d ':'>aa uid=50 while [ $uid -le 65535 ] # 65535 is last user id do grep $uid aa>>bb uid='expr $uid+1' done sort bb # order by first digit Sample Run
$sh prg76 500 501 502 51 65534 68 69 74 77 81 99
77. Program for Swapping of Two Numbers. $vi prg77 clear echo Enter the first number read a echo Enter the second number read b c=$a a=$b b=$c echo After swapping echo first number is $a echo second number is $b Sample Run
$sh prg77 Enter the first number 5 Enter the second number 6 After swapping first number is 6 second number is 5
78. Write a Program to check whether a number given by the user is zero, positive or negative. $vi prg78 clear echo Enter the Number read x if [ $x -gt 0 ] then echo x is Positive elif [ $x -eq 0 ] then echo x is a Zero else echo x is Negative fi Sample Run
$sh prg78 Enter the Numbe 2 x is Positive
$sh prg78 Enter the Number 0 x is a Zero $sh prg78 Enter the Number -3 x is Negative
79. Program for checking the login id & password. $vi prg79 clear echo Enter the login id read login echo Enter the password read password if [ $login = root ] then if [ $password = redhat ] then echo You entered the correct login name and password fi else echo login failed fi Sample Run
$sh prg79 Enter the login id root Enter the password unix login failed $sh prg79 Enter the login id root Enter the password redhat You entered the correct login name and password $sh prg79 Enter the login id unix Enter the password redhat login failed
80. Program to find the sum of numbers entered through command-line. $vi prg80 clear sum=0 for i in $* do sum='expr $sum + $i' done echo The sum of the given numbers is $sum Sample Run
$sh prg80 30 40 The sum of the given numbers is 70
81. The length & breadth of a rectangle and radius of a circle are input through the keyboard. Write a program to calculate the area & perimeter of the rectangle, and the area & circumference of the circle. $vi prg81 cleare cho Enter length, breadth and radius read length breadth radius areaR='expr $length \* $breadth' perimeterR='expr 2 \* $ $length + $breadth $' areaC='echo 3.14 \* $radius \* $radius |bc' cirC='echo 2\* 3.14 \* $radius |bc' echo 'Area of rectangle = '$areaR echo 'Perimeter of rectangle = '$perimeterR echo 'Area of circle = '$areaC echo 'Circumference of circle = '$cirC Sample Run
$sh prg81 Enter length, breadth and radius 20 5 5 Area of rectangle = 100 Perimeter of rectangle = 50 Area of circle = 78.50 Circumference of circle = 31.40
82. If a five digit number is input through the keyboard, write a program to calculate the sum of its digits. $vi prg82 clearecho Enter any five digit number read num d1='expr $num % 10' num='expr $num / 10' d2='expr $num % 10' num='expr $num / 10' d3='expr $num % 10' num='expr $num / 10' d4='expr $num % 10' num='expr $num / 10' d5='expr $num % 10' sum='expr $d1 + $d2 + $d3 + $d4 + $d5' echo Sum of digits = $sum Sample Run
$sh prg82 Enter any five digit number 12345 Sum of digits = 15
83. If cost price and selling price of an item is input through the keyboard, write a program to determine whether the seller has made profit or incurred loss. Also determine how much profit was made or loss incurred. $vi prg83 clear echo Enter cost price of the item
read cp echo Enter selling price of the item read sp if [ $sp -gt $cp ] then echo Seller had made profit profit='echo $sp - $cp | bc' echo Profit = $profit else if [ $cp -gt $sp ] then echo Seller has incurred loss loss='echo $cp - $sp | bc' echo Loss = $loss else echo No profit, no loss fi fi Sample Run
$sh prg83 Enter cost price of the item 1500 Enter selling price of the item 2000 Seller had made profit Profit = 500
84. Write a program to calculate overtime pay of employees. Overtime is paid at the rate of Rs. 12.00 per hour for every hour worked above 40 hours. Assume that employees do not work for fractional part of an hour. $vi prg84 Clear Echo How many employees are there? Read number emp=1 while [ $emp -le number ] do echo enter working hours for employee number $emp read hours if [ $hours -gt 40 ] then otpay='expr $ $hours - 40 $ \* 12' echo overtime pay = Rs. $otpay else echo no overtime pay fi emp='expr $emp + 1' done Sample Run
$sh prg84 How many employees are there? 5 enter working hours for employee number 1 12 no overtime pay enter working hours for employee number 2 21 no overtime pay
enter working hours for employee number 3 33 no overtime pay enter working hours for employee number 4 45 overtime pay = Rs. 60 enter working hours for employee number 5 50 overtime pay = Rs. 120
85. Write a program to generate all combinations of digits 1, 2 and 3 to form different numbers using for loops. $vi prg85 clear for i in 1 2 3 do for j in 1 2 3 do for k in 1 2 3 do echo $i $j $k done done done Sample Run
$sh 1 1 1 1 1 1 1 2 1 2 1 2 1 3 1 3 1 3 2 1 2 1 2 1 2 2 2 2 2 2 2 3 2 3 2 3 3 3 3 3 3 3 3 3 3 1 1 1 2 2 2 3 3 3 prg85 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3
86. Write a program to check whether a given number is an Armstrong number or not, An Armstrong number is one in which the sum of cube of each of the digits equals that number. $vi prg86 clear echo Enter a Number read n
m=$n s=0 while [ $n -gt 0 ] do q='expr $n / 10' r='expr $n - $ $q \* 10 $' s='expr $s + $ $r \* $r \* $r $' n=$q done if [ $s -eq $m ] then echo The Number Is Armstrong else echo The Number Is Not Armstrong fi $sh prg86 Enter a Number 153 The Number Is Armstrong $sh prg86 Enter a Number 152 The Number Is Not Armstrong 87. Write a program to print out all Armstrong numbers between 1 and 500. If sum of cubes of each digit of the number is equal to the number itself, then the number is called an Armstrong number. For example, 153= (1*1*1)+(5*5*5)+(3*3*3) $vi prg87 clear i=1 echo Armstrong numbers are while [ $i -le 500 ] do a='echo $i % 10|bc' b='echo $i % 100|bc' b='echo $ $b - $a $ / 10|bc' c='echo $i / 100|bc' sum='echo $ $a \* $a \* $a $ + $ $b \* $b \* $b $ + \ ($c \* $c \* $c \)|bc' if [ $sum -eq $i ] then echo $i fi i='expr $i + 1' done Sample Run
$sh prg87 Armstrong numbers are 1 153 370 371 407
88. Write a program for swapping of two numbers without using any third variable. $vi prg88 clear echo enter numbers a and b read a read b
b='expr $a -$b' a='expr $a - $b' b='expr $a + $b' echo After Swapping echo a = $a echo b = $b Sample Run
$sh prg88 enter numbers a and b 12 3 After Swapping a = 3 b = 12 $sh prg88 enter numbers a and b 21 23 After Swapping a = 23 b = 21
89. Program to get pid of the process. $vi prg89.c #include<stdio.h> #include<sys/types.h> int main() { int pid; pid=getpid(); printf("The process id of the process is %d\n",pid); return 0; } Compile $cc -o prg89 prg89.c Run $./prg89 Output is The process id of the process is 4884 90. Program to get pid of the parent process. $vi prg90.c #include<stdio.h> #include<sys/types.h> int main() { int ppid; ppid=getppid(); printf("The process id of the parent process is %d\n",ppid); return 0; } Compile $cc -o prg90 prg90.c Run $./prg90 Output is The process id of the parent process is 4904
Parent and Child Process Any running program is called a process. From the process we can create another process. There is a parent-child relationship between these two processes. The way to achieve this is by using a function called fork(). This function splits the running process into two processes at the point where fork is called. The first is known as parent and the new process created is known as child. Both the processes have same copy of the code after the point where fork() is called. 91. Program to show how fork() divide the process into two parts. $vi prg91.c #include<stdio.h> #include<sys/types.h> int main() { printf("Hello\n"); fork(); #fork system call is used to create child printf("World\n"); return 0; } Compile $cc -o prg91 prg91.c Run $./prg91 Output is Hello World World 92. Program to show the existence of both child and parent processes. $vi prg92.c #include<stdio.h> #include<sys/types.h> int main() { int pid; pid=fork(); #pid=pid of child (fork() returns pid of child process) if(pid==0) { #This part gets executed in child printf("I am child. The value of variable pid is %d\n", pid); printf("I am child and my process id is %d\n", getpid()); printf("I am child and my parent process id is %d\n", getppid()); } else { #This part gets executed in parent printf("I am parent. The value of pid is %d\n", pid); printf("I am parent and my process id is %d\n", getpid()); printf("I am parent and my parent process id is %d\n", getppid()); } return 0; } Compile $cc -o prg92 prg92.c Run
$./prg92 Output is I am child. The value of variable pid is 0 I am child and my process id is 4985 I am child and my parent process id is 4984 I am parent. The value of pid is 4985 I am Parent and my process id is 4984 I am Parent and my parent process id is 4822
Zombie and Orphans When we fork a new child process and the parent and the child continue to execute, there are two possibilities either the child process ends first or the parent process ends first. If child terminates earlier than the parent then the parent process is known as Zombie. If parent terminates earlier than the child then the child process is known as Orphan. 93. Program to show the orphan process. #include<stdio.h> #include<sys/types.h> int main() { int pid; pid=fork(); if(pid==0) { printf("I am child and my pid is %d\n",getpid()); printf("I am child and my ppid is %d\n",getppid()); sleep(10); printf("\nI am child and my pid is %d"\n,getpid()); printf("I am child and my ppid is %d\n",getppid()); } else { printf("I am parent and my pid is %d\n",getpid()); printf("I am parent and my ppid is %d\n",getppid()); } } Compile $cc -o prg93 prg93.c Run $./prg93 Output is I am child and my pidis 4943 I am child and my ppid is 4942 I am parent and my pid is 4942 I am parent and my ppid is 4868 [root@localhost ~]$ I am child and my pid is 4943 these two lines are display I am child and my ppid is 1 after 10 seconds Here parent has expired so now child is orphan 94. Program to show the Zombie process. #include<stdio.h> #include<sys/types.h> int main() {
if(fork()>0) { sleep(20); printf("Parent\n"); } } Compile $cc -o prg94 prg94.c Run $./prg94 Output is displayed after some time Parent 95. Program to show the division of process by fork. #include<stdio.h> #include<sys/types.h> int main() { int i=0,j=0,pid; pid=fork(); if(pid==0); { for(i=0;i<100;i++) printf("%d ? ? ?",i); } else { for(j=0;j100;j++) printf("%d * * *",j); } printf("\n"); } Compile $cc -o prg95 prg95.c Run $./prg95 Output is display after some time 0 ? ? ?1 ? ? ?2 ? ? ?3 ? ? ?4 ? ? ?5 ? ? ?6 ? ? ?7 ? ? ?8 ?10 ? ? ?11 ? ? ?12 ? ? ?13 ? ? ?14 ? ? ?15 ? ? ?16 ? ? ?17 ? ?19 ? ? ?20 ? ? ?21 ? ? ?22 ? ? ?23 ? ? ?24 ? ? ?25 ? ? ? ? ?28 ? ? ?29 ? ? ?30 ? ? ?31 ? ? ?32 ? ? ?33 ? ? ?34 ? ? ? ? ?37 ? ? ?38 ? ? ?39 ? ? ?40 ? ? ?41 ? ? ?42 ? ? ?43 ? ? ? ? ?46 ? ? ?47 ? ? ?48 ? ? ?49 ? ? ?50 ? ? ?51 ? ? ?52 ? ? ? ? ?55 ? ? ?56 ? ? ?57 ? ? ?58 ? ? ?59 ? ? ?60 ? ? ?61 ? ? ? ? ?64 ? ? ?65 ? ? ?66 ? ? ?67 ? ? ?68 ? ? ?69 ? ? ?70 ? ? ? ? ?73 ? ? ?74 ? ? ?75 ? ? ?76 ? ? ?77 ? ? ?78 ? ? ?79 ? ? ? ? ?82 ? ? ?83 ? ? ?84 ? ? ?85 ? ? ?86 ? ? ?87 ? ? ?88 ? ? ? ? ?91 ? ? ?92 ? ? ?93 ? ? ?94 ? ? ?95 ? ? ?96 ? ? ?97 ? ? ? ? ?0 * * *1 * * *2 * * *3 * * *4 * * *5 * * *6 * * *7 * * * *10 * * *11 * * *12 * * *13 * * *14 * * *15 * * *16 * * * * *19 * * *20 * * *21 * * *22 * * *23 * * *24 * * *25 * * * * * * * * * * * * * * * * * * *28 *37 *46 *55 *64 *73 *82 *91 * * * * * * * * * * * * * * * * *29 *38 *47 *56 *65 *74 *83 *92 * * * * * * * * * * * * * * * * *30 *39 *48 *57 *66 *75 *84 *93 * * * * * * * * * * * * * * * * *31 *40 *49 *58 *67 *76 *85 *94 * * * * * * * * * * * * * * * * *32 *41 *50 *59 *68 *77 *86 *95 * * * * * * * * * * * * * * * * *33 *42 *51 *60 *69 *78 *87 *96 * * * * * * * * * * * * * * * * *34 *43 *52 *61 *70 *79 *88 *97 * * * * * * * * * * * * * * * *
? ? ?9 ? ? ? ? ?18 ? ?26 ? ? ?27 ?35 ? ? ?36 ?44 ? ? ?45 ?53 ? ? ?54 ?62 ? ? ?63 ?71 ? ? ?72 ?80 ? ? ?81 ?89 ? ? ?90 ?98 ? ? ?99 * *8 * * *9 *17 * * *18 *26 * * *27 *35 *44 *53 *62 *71 *80 *89 *98 * * * * * * * * * * * * * * * * *36 *45 *54 *63 *72 *81 *90 *99
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Binary Search Suppose that the elements of the array A are sorted in ascending order, if the elements are numbers, or dictionary order if the elements are alphanumeric in nature. The best searching algorithm, called binary search, is used to find the location of the given element. 96. Write a shell script to implement the binary search algorithm. $vi prg96 clear echo Enter size of array read size echo Enter elements i=0 while [ $i -lt $size ] do read a[$i] i='expr $i + 1' done i=0 while [ $i -lt $size ] do echo "${a[$i]}" i='expr $i + 1' done echo Enter search element read num beg=0 last='expr $size - 1' found=0 while [ $found -eq 0 -a $beg -le $last ] do mid='expr $ $beg + $last $ / 2 if test ${a[$mid]} -eq $num then echo Element is found echo Position is $mid found=1 elif ${a[$mid]} -gt $num then last='expr $mid - 1' else beg='expr $mid + 1' fi done if test $found -eq 0 then echo element is not found fi Sample Run
$sh prg96 Enter size of array 7 Enter elements 3 4 5 6
7 8 9 Enter search element 5 Element is found Position is 2
Sample Run
$sh prg96 Enter size of array 6 Enter elements 4 5 6 7 8 9 Enter search element 1 element is not found
97. Temperature of a city in Fahrenheit degree is input through the keyboard WAP to convert this temperature into Centigrade degrees. Formula is c/100=f-32/180 f=9/5*c+32 $vi prg97 clear echo Enter temperature in Celsius scale : read c f='echo 9 / 5 \* $c + 32 | bc' echo echo Equivalent temperature in Fahrenheit = $f Sample Run
$sh prg97 Enter temperature in Celsius scale : 60 Equivalent temperature in Fahrenheit = 92
98. In a town, the percentage of men is 52. Rest all are women. The percentage of total literacy is 48. If total percentage of literate men is 35 of the total population, WAP to find the total number of illiterate men and women. The population of the town is 80,000. $sh prg98 clear a=80000 totman ='expr $ $a \* 52 $ / 100' totwman='expr $a - $totman' totLitPeople = 'expr $ $a \* 48 $ / 100' litman='expr $ $a \* 35 $ / 100' litwman='expr $totLitPeople - $litman' ilitman='expr $totman - $litman' ilitwman='expr $totwman - $litwman'
echo echo echo echo echo echo
'total man 'total woman 'literate man 'literate woman 'illiterate man 'illiterate woman
= = = = = =
'$totman '$totwman '$litman '$litwman '$ilitman '$ilitwman
Sample Run
$sh prg98 total man total woman literate man literate woman illiterate man illiterate woman
= = = = = =
41600 38400 28000 13600 13600 24800
99. If the three sides of a triangle are entered through the keyboard. WAP to check whether the triangle is equilateral, isosceles, or scalene triangle. $sh prg99 clear echo Enter three sides of the triangle read a b c echo if [ $a -eq $b -a $a -eq $c ] then echo Triangle is Equilateral elif [ $a -eq $b -o $a -eq $c -o $b -eq $c ] then echo Triangle is Isosceles elif echo Triangle is Scalene fi Sample Run
$sh prg99 Enter three 30 75 75 Triangle is Enter three 60 60 60 Triangle is Enter three 38 30 35 Triangle is
sides of the triangle Isosceles sides of the triangle Equilateral sides of the triangle Scalene
100. An Insurance company follows following rules to calculate premium. i. If a person's health is excellent and the person is between 25 and 35 years of age and lives in a city and is a male then Premium is Rs. 4 per thousand and his policy amount cannot exceed Rs. 2 lakhs. ii. If a person satisfies all the above conditions except that the sex is female then the premium is Rs. 3 per thousand and her policy amount cannot exceed Rs. 1 lakh. iii. if a person's health is poor and the person is between 25 and 35 years of age and lives in a village and is a male then the Premium is Rs. 6 per thousand and his policy cannot exceed Rs. 10,000. iv. In all other cases the person is not insured. Write a program to output whether the person should be insured or not, his/her Premium rate and maximum amount for which he/she can be insured.
$vi prg100 clear echo Enter age of the person read age echo Enter where he lives (city or village)? ead liv echo Enter gender (male or female)? read gender echo Enter health (poor or excellent)? read health echo if [ $age -ge 25 -a $age -le 35 -a $liv = 'city' -a $gender = 'male' -a $health = excellent] then echo The person should be insured echo Premium is Rs.4 per thousand echo Policy amount cannot exceed Rs.2 lakh elif [ $age -ge 25 -a $age -le 35 -a $liv = 'city' -a $gender = 'female' -a $health = 'excellent' ] then echo The person should be insured echo Premium is Rs.3 per thousand echo Policy amount cannot exceed Rs.1 lakh elif [ $age -ge 25 -a $age -le 35 -a $liv = 'village' -a $gender = 'male' -a $health = 'poor'] then echo echo echo else echo fi The person should be insured Premium is Rs.6 per thousand Policy amount cannot exceed Rs.10,000 The person should not be insured
Sample Run
$sh prg100 Enter age of the person 26 Enter where he lives (city or village)? city Enter gender (male or female)? male Enter health (poor or excellent)? excellent The person should be insured Premium is Rs.4 per thousand Policy amount cannot exceed Rs.2 lakh $sh prg100 Enter age of the person 33 Enter where he lives (city or village)? city Enter gender (male or female)? female Enter health (poor or excellent)? excellent The person should be insured Premium is Rs.3 per thousand Policy amount cannot exceed Rs.1 lakh $sh prg100 Enter age of the person 3 Enter where he lives (city or village)? village Enter gender (male or female)? male
Enter health (poor or excellent)? poor The person should be insured Premium is Rs.6 per thousand Policy amount cannot exceed Rs.10,000 $sh prg100 Enter age of the person 24 Enter where he lives (city or village)? village Enter gender (male or female)? male Enter health (poor or excellent)? poor The person should not be insured

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100 Shell Programs in Unix

Part II: Programs

Page 2 / 55 ReprintedforCTS/215337,CognizantTechnologySolutions LaxmiPublications,LaxmiPublicationsPvt.Ltd.(c)2009,CopyingProhibited

44 b is greatest $sh prg2 enter the value 78 33 44 a is greatest

bc' 100 bc' 100

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amount='expr $pa + $tax echo cash payment =$amount Sample Run

performed operation on a and b is

performed operation on a and b is

performed operation on a and b is

performed operation on a and b is

Page 4 / 55 ReprintedforCTS/215337,CognizantTechnologySolutions LaxmiPublications,LaxmiPublicationsPvt.Ltd.(c)2009,CopyingProhibited

2 $sh prg5 enter a and b 4 5 enter operation to f no valid operation

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fi cp $1 $2 echo copy successful Sample Run

12. Generate a table of an input integer.

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done echo Greatest input is $j Sample Run

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string Palindrome string not Palindrome

(e) (f) (g) (h)

Pwd clear date mkdir cd d mkdir cd d1 touch chmod ls

d d1 file1 file2 644 file1 file2

$sh prg40 enter numbers a and b 47 3 GCD = 1

$no elements -lt $no ] n[$i]

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70. To calculate simple interest.

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echo Hello $name Sample Run

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$sh prg76 500 501 502 51 65534 68 69 74 77 81 99

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Page 42 / 55 ReprintedforCTS/215337,CognizantTechnologySolutions LaxmiPublications,LaxmiPublicationsPvt.Ltd.(c)2009,CopyingProhibited

$sh prg80 30 40 The sum of the given numbers is 70

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7 8 9 Enter search element 5 Element is found Position is 2

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echo echo echo echo echo echo

'$totman '$totwman '$litman '$litwman '$ilitman '$ilitwman

41600 38400 28000 13600 13600 24800

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