linux-commands.md

Linux Cheat Sheet

1. Linux distribution related commands

• How to find the distribution details

  $ cat /etc/*release
  

1. File Utilities

• Delete all files except those with extension 'rs'

  $ find . -type f -not -name '*.rs' -print0 | xargs -0 rm

• Make compressed archive

  $ tar cfJ foo.tar.xz foo/ bar/

• Uncompress an archive

  $ tar xfJ foo.tar.xz foo/ bar/

1. Network Commands

   • wget

     - #### Get the public ip
     
       ```bash   
       
       $ dig +short myip.opendns.com @resolver1.opendns.com
       
       ```
        
       or by
        
       ```bash   
       
       $ dig TXT +short o-o.myaddr.l.google.com @ns1.google.com
       
       ```
     

   • ss(socket statistics)

     - #### List all tcp ports with port number 
     
       ```bash
        
       $ ss -nlt
     
       ```
     
     - ##### List all ipv4 listening ports
     
       ```bash
     
       $ ss -4 -n state listening
     
       ```