Random shell scripts.
I have two sets of available speakers -- a desktop set, and the speakers on my TV (via HDMI). Switching locations means going into KDE's audio settings and clicking some things. I wanted a convenient way to switch which speakers were active. So 'change-audio TV' moves everything to the TV, and 'change-audio desktop' moves everything to the desktop.
This is what I use to overcome the fact that KDE has no reliably useful way to change your desktop background from the command line for 2 monitors.
Basically, I set the desktop background for each monitor to a slideshow for a set directory (/wallpapers/slide/L/ and /wallpapers/slide/R/). Then I run this script to copy from my main wallpaper directory into each of those directories, constantly overwriting a single file (L.jpg and R.jpg). I mostly just run change-desktop rand which will choose one at random, but it is also set up to specify the wallpaper slug, e.g. change-desktop adventure-time which will copy adventure-time-L.jpg and adventure-time-R.jpg into the appropriate spots.
Example script to show how to add a randomly chosen playlist to the current queue of Clementine (music player) and start it.
Parses a directory containing episodes of some season of some show, scrapes IMDB to grab the episode titles, and renames all the files in order to the format SXXEYY - Episode Title.
Borrowed from here: http://askubuntu.com/questions/71863/how-to-change-pulseaudio-sink-with-pacmd-set-default-sink-during-playback
Convert any random video format to mp4 using avconv.
This is my tool to deal with the fact that I don't have a paid cable subscription and miss the ease of plopping down in front of the TV and having something random play on its own. It basically just chooses a random episode from my TV directory, although you can also specify a show (random-episode futurama) or a type of show (random-episode cartoons), and opens it with VLC.
Use in a directory of sequential images to generate a timelapse movie. For example, timelapse -o output.mp4 -f 36 for a 36 fps movie. Requires zeropad.
I made this to create highlight videos of NFL and NBA games. Input a video file, specify an output file, start time offset, duration and period of the highlights, and a highlight video will be produced. Works only for MP4 at the moment.
Creates an image that includes metadata about a video and tiled screengrabs at regularly spaced intervals.
Creates a thumbnail of a video by grabbing a frame about halfway through.
Used for renaming files. Borrowed from here: http://stackoverflow.com/questions/5417979/batch-rename-sequential-files-by-padding-with-zeroes