A script full of functions that I perform often, like:

• Probe every 5min for internet connection. Play Black Sabbath when there is. (My internet goes down often.)
• Create individual tarballs/zips/rars for each subdir.
• Extract all tarballs/zips/rars from a dir. (It detects the format on its own)
• Extract all files of a DwarFS file into a dir.
• Re-encode all vids from a dir.
• Delete all thumbnail pictures from my user.
• Find and remove all desktop.ini and thumbs.db files in a dir, recursively.

My .bashrc then sources that script, so to use those functions I simply open a terminal. And if I ever need to delete my .bashrc and recreate it anew, they’re safely stored in my scripts directory.