Commands by tkb (1)

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HTML5 ogg player
find OGG audio files on your *nix box and listen to them using your web browser

bulk rename files with sed, one-liner
Far from my favorite, but works in sh and with an old sed that doesn't support '-E'

Download Youtube video with wget!
Nothing special required, just wget, sed & tr!

check open ports without netstat or lsof

locate a filename, make sure it exists and display it with full details
use the locate command to find files on the system and verify they exist (-e) then display each one in full details.

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"

Brute force discover
Show the number of failed tries of login per account. If the user does not exist it is marked with *.

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

Find the package that installed a command

Swap a file or dir with quick resotre
This lets you replace a file or directory and quickly revert if something goes wrong. For example, the current version of a website's files are in public_html. Put a new version of the site in public_html~ and execute the command. The names are swapped. If anything goes wrong, execute it again (up arrow or !!).

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