Linux Commands

1. System reference manuals.

   • man

     Options: <1, 2, 3, 4, 5, 6, 7, 8, 9>

     Example 1: man man

     Example 2: man 1 pwd

     Example 3: man 2 strlen

2. Command to install package

   • apt-get (For Ubuntu)

     Options: <install, update, upgrade>

     Example: sudo apt-get install sl

   • yum or dnf (For Fedora/Redhat)

     Options:

     Example 1: sudo yum install sl

     Example 2: sudo dnf install sl

3. Basic command for files or directory

   • touch

   • rm

     options: <-i, -r>

   • cp

     options: <-l, -a, -r, -f, -i, -v, --help>

   • mv

     options: <-l, -a, -f, -i, -v, --help>

   • ln

     options: <-s>

   • pwd

   • cd

     options: < .., dir_path, /, ~/ >

   • ls

     options: <-l, -t, -r, -h, -a, -R>

   • mkdir

     options: <-p>

   • rmdir

     options: <-r -f>

   • tree

     options: <-d -f>

4. Command to view files

   • cat
   • head
   • tail
   • less
   • more

5. Commands to check/modify file properties

   • file

   • stat

   • wc

     options: <-c, -b, -l>

   • chmod

     options: <+x>

   • chown

   • du

     options: <-s, -h, -a>

6. Command to compare files/directory

   • md5sum
   • diff
   • comm
   • cmp
   • meld

7. Comand to search/find a file

   • find

     Example 1: To Find all executable file in a directory recursevely

       find . -type f -executable
     

     Example 2: To limit the search to current directory only

       find . -maxdepth 1 -type f -executable
     

     Example 3: To Find all executable file in a directory recursevely and remove it

       find . -type f -executable | xargs rm
     

   • locate

   • which

   • whereis

8. Command to search/match-pattern inside file

   • grep

9. Command for Disk and filesystem

   • df

     options: <-h>

   • mount

   • unmount

   • fdisk

   • mkfs.ext3

   • mkfs.ext4

   • mkfs.vfat

   • mkfs.ntfs

10. Command to monitor system/process/user

    • uptime

    • uname

      options: <-a -r>

    • whoami

    • ps

      options: <-a -x>

    • top

    • pstree

    • kill

    • pkill

    • killall

11. Process scheduling command

    • sleep
    • watch
    • renice

12. Command for system environmental variable

    • env
    • export

13. Command for networking

    • ifconfig
    • ping
    • ssh
    • scp

14. Compression and file packaging command

    • tar
    • zip
    • unzip
    • rar

15. Command to get Kernel Logs

    • dmesg

      options: <-c>

16. Command to load/unload driver

    • insmod
    • rmmod
    • modprobe

17. importent BASH variables

    • PATH
    • PWD

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