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Detect illegal access to kernel space, potentially useful for Meltdown detection
Based on capsule8 agent examples, not rigorously tested

determine if tcp port is open
Requires netcat.

swap stdout and stderr
Possible use, to filter something in stderr: (/usr/bin/$COMMAND $PARAM 3>&1 1>&2 2>&3 | grep -v $uninteresting_error ) 3>&1 1>&2 2>&3

remove empty lines

Display 6 largest installed RPMs sorted by size (descending)
Low on disk space? Check the largest installed RPMs for delete canditates.

list block devices
Shows all block devices in a tree with descruptions of what they are.

Rip a CD/DVD to ISO format.
An easy method to generate ISOs from CD/DVD media.

Get all upgradable deb packages in a single line
Works for debian and ubuntu based distros.

use SHIFT + ALT to toggle between two keyboard layouts
change the last two-character abbreviation to any layout abbreviation you want. This command will only run in the current session, add to your ~/.bashrc to make this permanent.

eavesdrop
Record off the microphone on a remote computer and listen to it live through your speakers locally.


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