UMOUNT(8) umount - o umount -a [-dflnrv] [-t -] [-O ...] umount [-dflnrv] {|} umount -h|-V umount . . , , . ,," - , , , . umount - ,,libc", ,,libc" , , . , . --lazy. -a, --all /proc/self/mountinfo ( /etc/mtab) , ,,proc", ,,devfs", ,,devpts", ,,sysfs", ,,rpc_pipefs" ,,nfsd" . ,,umount" --types. -A, --all-targets . ( -, .). --recursive, . /etc/mtab /proc/mounts. -c, --no-canonicalize . stat(2) readlink(2). ( NFS- ). . umount . mount(8) . umount /sbin/umount.. -d, --detach-loop , . mount-(8), ,,autoclear" . --fake ,,umount"-; ,," . /etc/mtab -n. -f, --force ( NFS ). . readlink(2) stat(2) NFS- umount-. -i, --internal-only /sbin/umount.- . . -l, --lazy . , . . umount -l umount . . -N, --namespace - umount ns. ns . umount /etc/fstab, /etc/mtab ( /run/mount) umount(2) , . umount(2) . mount_namespaces(7) . -n, --no-mtab /etc/mtab. -O, --test-opts ... /etc/fstab. . no . -q, --quiet ,, " . -R, --recursive . . /proc/self/mountinfo . ; ( -) . 2.37 ( ). -r, --read-only , . -t, --types ... . . no . umount (/proc/mounts) /etc/fstab (., ,,nfs4" vs. ,,nfs"). -v, --verbose . -h, --help . -V, --version . , . , fstab user , . mount(8) . 2.34 umount . fstab user= . 2.35, umount libmount-. ,,suid" . (. , , .). umount mount(8) /etc/mtab. ,,autoclear" ( losetup(8) ), --detach-loop losetup -d . 2.6.25. v3.7 ,, ". . , udevadm settle umount. umount ( ORed): 0 1 2 ( , , ) 4 mount 8 16 /etc/mtab- 32 64 umount -a 0 ( ), 32 ( ), 64 ( , ). 126 ,,/sbin/umount.<>" ( ,,util-linux v2.41") : umount. {|} [-flnrv] [-N -] [-t .] ( uhelper= helper= ,,mtab" ). -t . : umount.fuse -t fuse.sshfs uhelper= ( ) /etc/mtab /etc/fstab ( udisks(1)). helper= mtab /sbin/umount. -. /etc/mtab helper= libmount-. The exit status value of the helper is returned as the exit status of umount(8). The value 126 is used if the mount helper program is found, but the execl(3) failed. LIBMOUNT_FSTAB=<> fstab ( suid) LIBMOUNT_DEBUG=all libmount /etc/mtab ( /proc/mounts) /etc/fstab /proc/self/mountinfo . umount 6 AT&T UNIX-. umount(2), losetup(8), mount_namespaces(7), mount(8) , ,,https://github.com/util-linux/util-linux/issues[issue tracker]". umount ,,util-linux" . util-linux 2.42.3 2026-09-02 UMOUNT(8)