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Useful to test programs and webpages.
Given a bunch of files with "wrong" date naming, it renames them in a "good" format.
You can get the mean value for the colours in an image. Then you can determine, in general, how dark or bright is the image and run some other actions based on that. I'll recommend to readjust the brightness of the images using +sigmoidal-contrast option of imagemagick convert command.
You can use it to connect to remote windows machine and start some scritps that need user login
Use it to send raw data to a networked device. Used to interact with relay controller board whose documentation is lost, so use wireshark to sniff the sent data and replayed using the command.
It takes a byte from /dev/random whose source is the kernel entropy pool (better source than other solutions).
If you have a directory with lot of backups (full backups I mean), when it gets to some size, you could want to empty some space. With this command you'll remove half of the files. The command assumes that your backup files starts with YYYYMMDD or that they go some alphabetical order.