Linux distributions support various GUIs (graphical user interfaces) but the old command line interface (bash) still proves to be easier and quicker in some situations. Bash and other Linux shells require you to type in commands to complete your tasks, and thus gets named the command line interface.

Commands are directives for the computer to carry out a task. You can use commands to shut down your computer, or show a list of files in the current directory or the contents of a text file, or to show a message on the screen. They’re easy and powerful at the same time.

  • ls – List
  • mkdir – Make Directory
  • pwd – Print Working Directory
  • cd – Change Directory
  • rmdir – Remove Directory
  • rm – Remove
  • cp – Copy
  • mv – MoVe
  • cat – concatenate and print files
  • tail – print TAIL (from last)
  • less – print LESS
  • grep
  • find
  • tar
  • gzip
  • unzip
  • help
  • whatis – What is this command
  • man – Manual
  • exit
  • ping
  • who – Who Is logged in
  • su – Switch User
  • uname
  • free – Free memory
  • df – Disk space Free
  • ps – ProcesseS
  • top – TOP processes
  • shutdown

See http://goo.gl/wNMvgD