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    Linux Commands That Sys Admins Should Know: Command Description

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    Madhav Reddy
    The document lists various Linux commands that system administrators should be familiar with, including commands to view network interfaces (ifconfig), change system settings (timedatectl, hostnamectl), search for files (find), manage archives (tar), view processes (top), check disk usage (df, du), and obtain system information (uname, lscpu, cat /proc/cpuinfo). It also covers commands for user management (su, whoami), logging (last), secure shell connections (ssh), and network diagnostics (netstat, nslookup). The commands described can help admins manage users, disks, processes, networking and obtain hardware details on Linux systems.

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    © All Rights Reserved
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    Linux Commands That Sys Admins Should Know: Command Description

    Uploaded by

    Madhav Reddy
    19 views2 pages
    The document lists various Linux commands that system administrators should be familiar with, including commands to view network interfaces (ifconfig), change system settings (timedatectl, hostnamectl), search for files (find), manage archives (tar), view processes (top), check disk usage (df, du), and obtain system information (uname, lscpu, cat /proc/cpuinfo). It also covers commands for user management (su, whoami), logging (last), secure shell connections (ssh), and network diagnostics (netstat, nslookup). The commands described can help admins manage users, disks, processes, networking and obtain hardware details on Linux systems.

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    Original Title

    Commands

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    The document lists various Linux commands that system administrators should be familiar with, including commands to view network interfaces (ifconfig), change system settings (timedatectl, hostnamectl), search for files (find), manage archives (tar), view processes (top), check disk usage (df, du), and obtain system information (uname, lscpu, cat /proc/cpuinfo). It also covers commands for user management (su, whoami), logging (last), secure shell connections (ssh), and network diagnostics (netstat, nslookup). The commands described can help admins manage users, disks, processes, networking and obtain hardware details on Linux systems.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    19 views2 pages

    Linux Commands That Sys Admins Should Know: Command Description

    Uploaded by

    Madhav Reddy
    The document lists various Linux commands that system administrators should be familiar with, including commands to view network interfaces (ifconfig), change system settings (timedatectl, hostnamectl), search for files (find), manage archives (tar), view processes (top), check disk usage (df, du), and obtain system information (uname, lscpu, cat /proc/cpuinfo). It also covers commands for user management (su, whoami), logging (last), secure shell connections (ssh), and network diagnostics (netstat, nslookup). The commands described can help admins manage users, disks, processes, networking and obtain hardware details on Linux systems.

    Copyright:

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

    Advanced Operating Systems - 5201

    kumar.aditya@humber.ca

    Linux Commands that Sys Admins should know

    Command Description

    Show you all of the last commands that have been recently executed.
    history It will simply print out the bash history of the current user to the screen.
    Commands are numbered, with older commands at the top and newer commands at the bottom.

     
     
    whoami To Determine the Current User logged in.
     
     
    su switch user
     
     
    ifconfig stands for "interface configuration." It is used to view and change the configuration of the network
    ifconfig
    interfaces on your system.
       
    nmtui (Lab Activity) Network Manager text user interface
       
    hostnamectl May be used to query and change the system hostname and related settings
     
     

    timedatectl may be used to query and change the system clock and its settings and enable or disable time
    timedatectl
    synchronization services.

     
     

    Used to search and locate the list of files and directories based on conditions you specify for files that match
    find the arguments.
    Find can be used in a variety of conditions like you can find files by permissions, users, groups, file type,
    date, size, and other possible criteria.

     
     

    The tar command stands for tape achieve, which is the most commonly used tape drive backup command
    used by the Linux/Unix system.
    tar
    It allows for you to quickly access a collection of files and placed them into a highly compressed archive file
    commonly called tarball, or tar, gzip, and bzip in Linux.

     
     

    chattr (Change Attribute) is a command line Linux utility that is used to set/unset certain attributes to a file in
    chattr Linux system to secure accidental deletion or modification of important files and folders, even though you are
    logged in as a root user.

    lsattr List attributes of a file


    Advanced Operating Systems - 5201
    kumar.aditya@humber.ca

    Linux Commands that Sys Admins should know


    Top command is used to show the Linux processes.
    It provides a dynamic real-time view of the running system.
    top
    Usually, this command shows the summary information of the system and the list of processes or threads
    which are currently managed by the Linux Kernel.
     
     
    df The df and du commands are two small utilities that are extremely useful. The df command displays the disk
    du free space and the du command displays the disk usage.
     
     

    Uptime is a command that returns information about how long your system has been running together with
    uptime the current time, number of users with running sessions, and the system load averages for the past 1, 5, and
    15 minutes.

     
     
    Who, when, and from where? Good security practices say you should know who's been accessing your Linux
    last system
    It is used to display the list of all the users logged in and out since the file /var/log/wtmp was created
     
     

    uname (short for unix name) is a computer program in Unix and Unix-like computer operating systems that
    uname
    prints the name, version and other details about the current machine and the operating system running on it.

     
     
    Command-line network utility that displays network connections for Transmission Control Protocol (both
    netstat incoming and outgoing), routing tables, and a number of network interface (network interface controller or
    software-defined network interface) and network protocol statistics
     
     

    nslookup (name server lookup) is a tool used to perform DNS lookups in Linux.
    nslookup It is used to display DNS details, such as the IP address of a particular computer, the MX records for a domain
    or the NS servers of a domain.

     
     
    The ssh command provides a secure encrypted connection between two hosts over an insecure network. Port
    ssh
    22 is used in ssh connections.
     
     
    lscpu The lscpu command in Linux displays information about the CPU architecture
     
     
    The file /proc/cpuinfo displays what type of processor your system is running including the number of CPUs
    cat /proc/cpuinfo
    present.

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