Permissions
The three options for the access rights of file and directories (d) are read (r), write (w) and execute (x). An example of how they appear in unix as follows:
drwxrw-r-- 5 j f 50 Feb 03 1998 Desktop
-rwxrw-r-- 5 j f 10 Mar 31 2003 Documents
Directories are indicated with a (d). The permissions are in groups of three