Linux Pocket Guide

Name

umount [options] [device | directory] — mount

Synopsis

/bin stdin stdout - file -- opt --help --version

umount is the opposite of mount: it makes a disk partition unavailable. For instance, if you’ve mounted a CD-ROM disc, you can’t eject it until it’s umounted:

$ umount /mnt/cdrom

Always unmount removable media before ejecting it or you risk damage to its filesystem. To unmount all mounted devices:

# umount -a

Don’t unmount a filesystem that’s in use; in fact, the umount command will refuse to do so for safety reasons.