umount from util-linux 2.27.1 (libmount 2.27.0: selinux, assert, debug)

Usage: umount [-hV] umount -a [options] umount [options] <source> | <directory> Unmount filesystems. Options: -a, --all unmount all filesystems -A, --all-targets unmount all mountpoints for the given device in the current namespace -c, --no-canonicalize don't canonicalize paths -d, --detach-loop if mounted loop device, also free this loop device --fake dry run; skip the umount(2) syscall -f, --force force unmount (in case of an unreachable NFS system) -i, --internal-only don't call the umount.<type> helpers -n, --no-mtab don't write to /etc/mtab -l, --lazy detach the filesystem now, clean up things later -O, --test-opts <list> limit the set of filesystems (use with -a) -R, --recursive recursively unmount a target with all its children -r, --read-only in case unmounting fails, try to remount read-only -t, --types <list> limit the set of filesystem types -v, --verbose say what is being done -h, --help display this help and exit -V, --version output version information and exit For more details see umount(8).