Commands by Karakh (2)

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check open ports without netstat or lsof

Batch convert PNG to JPEG
Convert all PNG images in directory to JPEG using ImageMagick, and delete the old PNG images.

Re-emerge all ebuilds with missing files (Gentoo Linux)
Revised approach to and3k's version, using pipes and read rather than command substitution. This does not require fiddling with IFS when paths have whitespace, and does not risk hitting command-line size limits. It's less verbose on the missing files, but it stops iterating at the first file that's missing, so it should be definitely faster. I expanded all the qlist options to be more self-describing.

Generate binary sequence data

Create a directory and go inside it
$_ expands to the last argument of the last command that was executed

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

Using PIPEs, Execute a command, convert output to .png file, upload file to imgur.com, then returning the address of the .png.
imgur < /etc/issue % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 2360 0 635 100 1725 1027 2792 --:--:-- --:--:-- --:--:-- 4058 http://i.imgur.com/bvbUD.png

Get ssh server fingerprints
Get your server's fingerprints to give to users to verify when they ssh in. Publickey locations may vary by distro. Fingerprints should be provided out-of-band.

An alarm clock using xmms2 and at
I like the order of the arguments better this way.

Generate random valid mac addresses
First set the variable $hexchars: $hexchars="0123456789ABCDEF" Change the number in the first for loop if you need less then 1200 mac addresses


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