There is a semi-famous quote (maybe by pg?) that I can't find, but it's something like: "If you're looking for startup ideas, look at the list of built-in command line programs in Unix and figure out which ones you can turn into a web service."
> Every Unix Command Becomes a Startup
-- https://matt-rickard.com/every-unix-command-becomes-a-startu... [2022-04-09]
> Every Unix command eventually become an internet service. Grep->Google, rsync->Dropbox, man->stack overflow, cron->ifttt ... etc
-- https://twitter.com/cdixon/status/505118160811728896 [2014-08-28]