The other day I learned about a new command that I wish I’d known about years ago: mountpoint

I’ve done all kinds of things grepping /proc/mounts (or the output from ‘mount’) in the past to try to determine whether a directory is a mountpoint or not, and there was a simple command for it all along.

$ mount

/dev/sdb2 on / type ext4 (rw,relatime,discard,errors=remount-ro)
/dev/sda2 on /home type ext4 (rw,relatime)
/dev/sdd1 on /media/external type ext4 (rw)

$ mountpoint /home
/home is a mountpoint

$ mountpoint /home/antisol
/home/antisol is not a mountpoint

$ umount /media/external

$ mountpoint /media/external || echo "Dammit"
/media/external is not a mountpoint
Dammit

# A Better Example:
$ mountpoint -q /some/dir || echo -e "\n** Setting up bind mount, sudo password may be required **\n" && sudo mount --bind /src/dir/ /some/dir