TIL: `~foo` expands to the HOME dir of that user in Bash

We know that ~ is $HOME, but it is more general than this. Usually, ~foo will expand to /home/foo, but could be anything as configured in /etc/passwd.

Very handy when dealing with multiple users.

There's even more expansions like ~+/foo and ~-N. See Bash manual for further info.

PS: This trick even works in Firefox!