Unix Commands

1. Files

1.1. Filename Substitution

Wild Cards ? *

Character Class (c is any single character) [c…]

Range [c-c]

Home Directory ~

Home Directory of Another User ~user

List Files in Current Directory ls [-l]

List Hidden Files ls -[l]a

1.2. File Manipulation

Display File Contents cat filename

Copy cp source destination

Move (Rename) mv oldname newname

Remove (Delete) rm filename

Create or Modify file pico filename

1.3. File Properties

Seeing Permissions ls -l filename

Changing Permissions chmod nnn filename

chmod c=p…[,c=p…] filename

n, a digit from 0 to 7, sets the access level for the user

(owner), group, and others (public), respectively. c is one of:

u–user; g–group, o–others, or a–all. p is one of: r–read

access, w–write access, or x–execute access.

Setting Default Permissions umask ugo

ugo is a (3-digit) number. Each digit restricts the default

permissions for the user, group, and others, respectively.

Changing Modification Time touch filename

Making Links ln [-s] oldname newname

Seeing File Types ls -F