Commands by Fuzzwah (0)

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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.

Get International Space Station sighting information for your city
This command outputs a table of sighting opportunities for the International Space Station. Find the URL for your city here: http://spaceflight.nasa.gov/realdata/sightings/

Labyrinth pattern
Generates labyrinth-like pattern on UTF-8 terminal in bash. For fun ;)

list files recursively by size

calculate how much bogomips one cpu core has (assuming you have 4 cores).
on some distro's you have to replace "BogoMIPS" with "bogomips".

Application network trace based on application name
This command takes an application name as an argument and then it will listen to the tcp traffic and capture packets matching the process Id of the application. The output shows: local address / local port / Remote Address / Remote port / State / Owning Process ID

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"

Enter a command but keep it out of the history
Put a space in front of your command on the command line and it will not be logged as part of your command line history.

check open ports without netstat or lsof

resize all JPG images in folder and create new images (w/o overwriting)
Convert all jpegs in the current directory into ~1024*768 pixels and ~ 150 KBytes jpegs


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