Linux Commands

Linux Commands that I rarely use and often forget.

pwd = (Print Working Directory) Displays the current directory you're in.

nmap = (Network Map) Utility that displays open network ports.
Basic usage: nmap 192.168.0.1

grep = Hard to explain, Filtering utility.
Basic usage: grep 'FilterString' filename
Usefull grep options:

-i 'FilterString'   =   case insensitive
-b #                =   Display # number of lines BEFORE a match
-a #                =   Display # number of lines AFTER a match
-v                  =   Invert Match or Exclusion
'FilterString1'\|'FilterString2'\|'FilterString3'  =  Multiple Filters

du = List the size of a file or Directory
Basic usage: du -hs <file or dir>
Usefull du options:

-h                  = human readable
-s                  = summarize (Display only total for each arguement)

TAR

Basic usage

to create a tar archive:

tar -pcvzf filename.tgz directory1/ directory2/

to extract an archive

tar -xvzf filename.tgz -C destination_directory/

Usefull tar options:

-x                  = extract
-c                  = create
-v                  = verbose (displays whats being archived or extracted on screen)
-j                  = use BZip format (.tar.bz2)
-z                  = use GZip format (.tar.gz or .tgz)
-p                  = Preserve file permissions
-f                  = File

More to come...