The CCR clusters are accessed through a command line interface. Users must be able to navigate using Linux/UNIX commands. The CCR Linux command reference card has a list of commonly used Unix commands with examples (see attachment below).
Here are a few basic UNIX commands that are helpful in getting started on the clusters:
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 (3 options):
cat filename
more filename
less filename
Edit a file (2 options):
emacs filename
vi filename
See attachment below for an introduction to UNIX file editors
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 and its contents:
chmod -R go-rwx directory-name
Man Pages:
- The man command will give usage information for any UNIX command.
- Press space bar or enter to page through man page.
- Type q to quit.
Example:
[cdc@u2:~]$ man ls
LS(1) User Commands LS(1)
NAME
ls - list directory contents
SYNOPSIS
ls [OPTION]... [FILE]...
DESCRIPTION
List information about the FILEs (the current directory by default).
Sort entries alphabetically if none of -cftuvSUX nor --sort.
Mandatory arguments to long options are mandatory for short options
too.
-a, --all
do not ignore entries starting with ....