Say that I've lost a particular file. I know part of the name, so I could use something like this to find it:
sudo find / -iname "*filename*"
...except that I can't remember which device or server I left it on. It could be on any one of my external drives, or on servera.example.com, or serverb.example.com, or in one of GitHub repositories... you get the idea.
I could go searching every different place one by one, but that would take ages and I'm lazy.
Is there a way I search all my local devices and remote servers (and possibly my GitHub repositories too!) at once for a filename that I've lost?
locateto find the file. Use something like pssh to do it on all machines at once. On your external drives: connect as many as you can at the same time, run
updatedb, save the database. Run
locatewhen you indexed them all. On GitHub: you can probably get away with a search.
glimpse, if you're willing to do the extra work. There are, of course, ready-made "desktop search" solutions for KDE and the like.