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    Sed Awk Commands

    Uploaded by

    Konda Pavankumar
    This document provides examples of using sed and awk commands to manipulate text files. Some examples include replacing or substituting text, running multiple sed commands, deleting lines within a range, and printing specific fields. Sed can be used to replace, insert, delete, or print lines matching patterns. Awk can print fields, filter lines, and perform other text manipulations.

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    © All Rights Reserved
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    Sed Awk Commands

    Uploaded by

    Konda Pavankumar
    45 views2 pages
    This document provides examples of using sed and awk commands to manipulate text files. Some examples include replacing or substituting text, running multiple sed commands, deleting lines within a range, and printing specific fields. Sed can be used to replace, insert, delete, or print lines matching patterns. Awk can print fields, filter lines, and perform other text manipulations.

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    sed-awk-commands

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    This document provides examples of using sed and awk commands to manipulate text files. Some examples include replacing or substituting text, running multiple sed commands, deleting lines within a range, and printing specific fields. Sed can be used to replace, insert, delete, or print lines matching patterns. Awk can print fields, filter lines, and perform other text manipulations.

    Copyright:

    © All Rights Reserved
    Download as DOC, PDF, TXT or read online from Scribd
    Download as doc, pdf, or txt
    45 views2 pages

    Sed Awk Commands

    Uploaded by

    Konda Pavankumar
    This document provides examples of using sed and awk commands to manipulate text files. Some examples include replacing or substituting text, running multiple sed commands, deleting lines within a range, and printing specific fields. Sed can be used to replace, insert, delete, or print lines matching patterns. Awk can print fields, filter lines, and perform other text manipulations.

    Copyright:

    © All Rights Reserved
    Download as DOC, PDF, TXT or read online from Scribd
    Download as doc, pdf, or txt
    of 2

    Examples

    1. Replacing or substituting string or all occurences


    sed 's/unix/linux/' file.txt or sed 's/unix/linux/g' file.txt
    2. Replacing the nth occurrence of a pattern in a line or all occurences
    sed 's/unix/linux/2' file.txt or sed 's/unix/linux/3g' file.txt
    3. Changing the slash (/) delimiter
    sed 's/http:\/\//www/' file.txt
    sed 's_http://_www_' file.txt
    sed 's|http://|www|' file.txt
    4. Using & as the matched string
    sed 's/unix/{&}/' file.txt sed 's/unix/{&&}/' file.txt
    5. Using \1,\2 and so on to \9
    sed 's/\(unix\)/\1\1/' file.txt
    sed 's/\(unix\)\(linux\)/\2\1/' file.txt
    6. Duplicating the replaced line with /p flag
    sed 's/unix/linux/p' file.txt
    7. Printing only the replaced lines
    sed -n 's/unix/linux/p' file.txt
    8. Running multiple sed commands.
    sed -e 's/unix/linux/' -e 's/os/system/' file.txt
    9. Replacing string on a range of lines.
    sed '1,3 s/unix/linux/' file.txt
    10. Replace on a lines which matches a pattern.
    sed '/linux/ s/unix/centos/' file.txt
    11. Deleting lines.
    sed '2 d' file.txt
    sed '5,$ d' file.txt
    12. Add a line after a match.
    sed '/unix/ a "Add a new line"' file.txt
    13. Add a line before a match
    sed '/unix/ i "Add a new line"' file.txt
    14. Change a line
    sed '/unix/ c "Change line"' file.txt
    15. Delete both leading and trailing white spaces from each line
    sed 's/^[ \t]*//;s/[ \t]*$//‘ file.txt
    ……..
    sed -e '1,10d' /etc/services | more
    sed -e '1,10d' /etc/services | more
    sed -n -e '/BEGIN/,/END/p' file.txt
    AWK Commands

    awk '{ print $NF }' print the last field of each line
    awk '{print NR "\t" $0}' file.txt precede each line by its line number FOR ALL FILES
    ls -lrt | awk '{ print NF ":" $0 } ' print the no of fields of each line
    ls -lrt | awk 'NF > 4' print the lines whose fields are more than 4
    awk 'NF > 4' print every line where the value of the last field is > 4
    # IN UNIX ENVIRONMENT: convert DOS newlines (CR
    awk '{sub(/\r$/,"")};1' format
    awk '{sub(/$/,"\r")};1' # IN UNIX ENVIRONMENT: convert Unix newlines (LF)
    awk '{gsub(/^[ \t]+|[ \t]+$/,"")};1' delete BOTH leading and trailing whitespace from each
    awk -F ":" '{print $1 | "sort" }'
    /etc/passwd print and sort the login names of all users
    awk 'NR < 11' print first 10 lines of file (emulates behavior of "head")
    awk 'NR>1{exit};1' print first line of file (emulates "head -1")
    awk 'END{print}' print the last line of a file (emulates "tail -1")
    awk '!($5 == "abc123")' print lines which have less than 5 fields

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