Commands using awk (1,418)

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Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Write comments to your history.
A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

Getting GnuPG Public Keys From KeyServer
get my GPG-key from pgp.surfnet.nl, key id is 19886493.

Rename files in batch

Parse compressed apache error log file and show top errors
credit shall fall to this for non-gzipped version: https://gist.github.com/marcanuy/a08d5f2d9c19ba621399

Execute a command before display the bash prompt
For example, if you are the type who type ls very often, then $ PROMPT_COMMAND=ls will ls after every command you issue.

use screen as a terminal emulator to connect to serial consoles
Use GNU/screen as a terminal emulator for anything serial console related. screen /dev/tty eg. screen /dev/ttyS0 9600 MacOSX: http://www.macosxhints.com/article.php?story=20061109133825654 Cheat Sheet: http://www.catonmat.net/blog/screen-terminal-emulator-cheat-sheet/

Get the IP address
gives u each configured IP in a seperate line.

Show which programs are listening on TCP ports
Alternative: $ ss -tlpn

Save your terminal commands in bash history in real time
Use this command if you want your terminal commands be saved in your history file in real time instead of waiting until the terminal is closed


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