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Schedule a script or command in x num hours, silently run in the background even if logged out
This is helpful for shell scripts, I use it in my custom php install script to schedule to delete the build files in 3 hours, as the php install script is completely automated and is made to run slow. Does require at, which some environments without crontab still do have. You can add as many commands to the at you want. Here's how I delete them in case the script gets killed. (trapped) atq |awk '{print $1}'|xargs -iJ atrm J &>/dev/null

Pick a random image from a directory (and subdirectories) every thirty minutes and set it as xfce4 wallpaper
Change your wallpaper every thirty minutes (or however long you like, I suppose) to a randomly selected image in a directory and subdirectories. Bear in mind this is not safe to use if anyone else has write access to your image directory.

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

Make vim open in tabs by default (save to .profile)
I always add this to my .profile rc so I can do things like: "vim *.c" and the files are opened in tabs.

Do some learning...
I like it sorted... 2> /dev/null was also needless, since our pipes already select stdin, only.

What is my ip?

Decode base64-encoded file in one line of Perl
If you are in an environment where you don't have the base64 executable or MIME tools available, this can be very handy for salvaging email attachments when the headers are mangled but the encoded document itself is intact.

Identify differences between directories (possibly on different servers)
This can be much faster than downloading one or both trees to a common servers and comparing the files there. After, only those files could be copied down for deeper comparison if needed.

Fast search in man files or bz-files by keyword direct by man or bz files
For example we need find fast where located and described keyword COMMIT_EDITMSG in man files. Here example howto solve it by search with command bzgrep in man files. Generally these files in bz compressed format. You can use another keywords to your search. Common syntax is: bzgrep -lE keyword1 /usr/share/man/man?/optional-keyword-to-refine* or bzgrep -lE keyword1 /usr/share/man/man?/* where optional-keyword-to-refine is optional and may be omitted but used to speedup search Of course you may combine other options for bzgrep (its based on grep)

Print names of all video files encoded with h264


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