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chmod is used to change the file permissions. This is a powerful tool and should not be under estimated.
Tip. if you want to know how a command works ito its parameters and function typing man command on the command line will give you access to the manual pages of the specific command
for instance
user@host~$man chmod
will give you something similar to (using Ubuntu Hardy 8.04)
NAME
chmod - change file mode bits
SYNOPSIS
chmod [OPTION]... MODE[,MODE]... FILE...
chmod [OPTION]... OCTAL-MODE FILE...
chmod [OPTION]... --reference=RFILE FILE...
DESCRIPTION
This manual page documents the G.....
Cheers,
Slayer