CCR's computing resources are primarily Linux based and therefore using them requires a basic
understanding of the Unix operating system. Some basic commands are provided below.

Basic Unix Commands

• Show pathname of current directory: pwd
• List files: ls
• Make a directory: mkdir directory-name
• Change directory: cd directory-name
  • Change directory back to home directory: cd
• Copy a file: cp old-filename new-filename
• View a file:
  • cat filename
  • more filename
  • less filename
• Edit a file:
  • emacs filename
  • vi filename
• Delete a file: rm filename
  • Delete a directory (recursively): rm -R directory-name
    • All files and subdirectories are deleted
• Move a file: mv old-filename new-filename
• Change permissions:
  • Arguments to chmod command: ugo+-rwx
    • where ugo are user, group and other; rwx are read, write and execute
  • Add execute permission for yourself: chmod u+x filename
  • Remove read, write and execute for group and other from a directory its contents:
    chmod -R go-rwx directory-name
• More Information:
  • Unix Reference Card
  • emacs Reference Card
  • vi Reference Card