Man umount -d In case the unmounted device was a loop device, also free this loop device. 98p4 で、無名デバイス (anonymous device) に対応するために umount (dir) の形での呼び出しが加えられた。 6 days ago · Linux man pages for umount and fusermount: You can access them using the man command in the terminal, e. SYNOPSIS umount [-hV] umount -a [-dflnrv] [-t vfstype] [-O options] umount [-dflnrv] {r p | p riph rique} La commande umount détache le(s) système(s) de fichiers mentionné(s) de la hiérarchie des fichiers. It is the same as systemd-mount --umount. It is used to attach file systems to the existing directory tree, allowing users to access data stored on various devices such as hard drives, USB drives, and network-attached storage. --fake Causes everything to be done except for the actual system call or umount helper execution; this 'fakes' unmounting the filesystem. umount (8) switches to the namespace when it reads /etc/fstab, writes /etc/mtab (or writes to /run/mount) and calls umount (2) system call, otherwise it runs in the original namespace. subtype] where suffix is the filesystem type (or the value from a uhelper= or helper= marker in the mtab file). Giving the special device on which the address space is considered "tainted". Learn how to use the umount command to detach file systems from the file hierarchy in Linux. Options for the umount command: -V Print version and exit. 15 2025-05-17 umount(2) Pages that refer to this page: mount (2), syscalls (2), proc_pid_mountinfo (5), capabilities (7), mount_namespaces (7), mount (8), umount (8) umount () and umount2 () remove the attachment of the (topmost) filesys- tem mounted on target. Jul 23, 2025 · What is the umount Command in Linux? To unmount mounted file systems from their mount points, use the umount command. man umount2 (2): umount () と umount2 () は target にマウントされている (最上位の) ファイルシステムを外す。 ファイルシステムのアンマウントを行うには、 適切な権限 (Linux では CAP_SYS_ADMIN ケーパビリティ) が必要である。 man mount (8): Unix のシステムにおいては、アクセスできるファイルはすべて 1 つの大きな ツリー構造にまとめられている。 これは / をルート (root:根) とする階層構造をなしている。 これらのファイル群は複数のデバイスにわたって配置することができる。 mount コマンドはあるデバイス上の DESCRIPTION top umount. nfs and umount. However, when fstab contains the user option on a line, anybody can umount the corresponding filesystem. umount () and umount2 () remove the attachment of the (topmost) file system mounted on target. umount () and umount2 () remove the attachment of the (topmost) filesys- tem mounted on target. Mount context — high-level API to mount operation. If none is specified, then umount will attempt to unmount all file systems in /etc/mnttab, with the exception of certain system required file systems: /, /usr, /var, /var/adm, /var/run, /proc, /dev/fd and /tmp. Note that umount does not pass this option to the /sbin/umount. its source. The automount program is used to manage mount points for autofs, the inlined Linux automounter. umount UMOUNT(8) System Administration UMOUNT(8) NAME umount - unmount filesystems SYNOPSIS umount -a [-dflnrv] [-t fstype] [-O option] umount [-dflnrv] {directory|device} umount -h|-V DESCRIPTION The umount command detaches the mentioned filesystem(s) from the file hierarchy. The root filesystem umount () and umount2 () remove the attachment of the (topmost) filesystem mounted on target. ) MNT_DETACH (since Linux 2. The umount (8) - SerenityOS man pages # Name umount - unmount file system # Synopsis $ umount <mountpoint> # Arguments mountpoint: File system path to unmount # Description umount run as root unmounts a file system mounted at specified mountpoint. mount , umount - mount or unmount file systems and remote resources mount attaches a file system to the file system hierarchy at the mount_point , which is the pathname umount Syntax umount [-fv] special | node umount -a | -A [-fv] [-h host] [-t type] Options -a All the filesystems described in fstab(5) are unmounted. -f The filesystem is forcibly unmounted. Since version 2. -n Unmount without writing in /etc/mtab. Processing on the file system, directory, or file completes and it is unmounted. Fournir le Nov 12, 2017 · GAD3R's reference to the man page answers your question: This is commonly used to change the mount flags for a filesystem, No where in the that explanation does it say the remount calls a umount function. Giving the special device on which umount 可以卸除当前挂载在文件层次目录中的文件系统。 文件系统形式可以是以它所在的目录的形式指定， 也可以是以它所在的特殊设备的形式来指定。 improvements to the information in this COLOPHON (which is not part of the original manual page), send a mail to man-pages@man7. -h Print help message and exit. # Examples quotes | docs | repo | golang | sam | man | acme | Glenda | 9times | harmful | 9P | cat-v. Un sistema de ficheros se puede especificar bien dando el directorio donde ha sido montado, o bien dando el dispositivo o fichero especial donde reside. 116 added the umount2 () system call, which, like umount (), unmounts a target, but allows additional flags controlling the behavior of the operation: The umount command will free the loop device (if any) associated with the mount, in case it finds the option `loop=' in /etc/mtab, or when the -d option was given. type helpers. Jul 31, 2025 · In the Linux operating system, the `mount` command is a fundamental and crucial tool. DEFINITIONS top The umount command detaches the mentioned file system (s) from the file hierarchy. 116 added the umount2 () system call, which, like umount (), unmounts a target, but allows additional flags controlling the behavior of the operation: MNT_FORCE (since Linux 2. Note that a file system cannot be unmounted when it is pmount ("policy mount") is a wrapper around the standard mount program which permits normal users to mount removable devices without a matching /etc/fstab entry. For example: umount. In this case fstabuser The syntax of external unmount helpers is: umount. man umount (8): umount コマンドは、ファイルの階層構造から指定したファイルシステムを切り離す。 ファイルシステムの指定には、システムをマウントしたディレクトリを与える。 またファイルシステムの実体が存在するスペシャルデバイスを与えることもできるが、 このやり方は古く、デバイス Aug 7, 2020 · Then if you want to remove that device from your Linux System, you need to use umount command to unmount that partition first and then physically remove the device. A file system is specified by giving the directory where it has been mounted. 116 以 降 ) 使 用 中 (busy) で も 強 制 的 に ア ン マ ウ ン ト を 実 行 す umount () and umount2 () remove the attachment of the (topmost) filesystem mounted on target. The command umount() and umount2() remove the attachment of the (topmost) file system mounted on target. We will go through the examples of mount and umount command in below sections to understand its usages with various devices and its partitions. type helpers. NON-SUPERUSER UMOUNTS top Normally, only the superuser can umount filesystems. The command mount returns the disks currently occupyed. La orden umount despega de la jerarquía o árbol de ficheros el/los sistema (s) de ficheros mencionado (s). If a mount point is not currently in use, then an initial call to umount2 () with this Historical details 元々の umount () 関数は umount (device) の形で呼び出され、 ブロックデバイス以外を指定して呼び出すと ENOTBLK を返した。 Linux 0. The filesystem is used to control how data is stored on the device or The umount command is a fundamental part of the Unix and Linux operating systems, dating back to the earliest versions. umount. 15 2025-05-17 umount(2) Pages that refer to this page: mount (2), syscalls (2), proc_pid_mountinfo (5), capabilities (7), mount_namespaces (7), mount (8), umount (8) This option is silently ignored by umount for non-root users. DESCRIPTION top Filesystem in Userspace (FUSE) is a simple interface for userspace programs to export a virtual filesystem to the Linux kernel. A filesystem is specified by giving the directory where it has been mounted. 116 か ら 、 umount2 () シ ス テ ム コ ー ル が 追 加 さ れ た 。 こ れ は umount () と 同 様 に target を ア ン マ ウ ン ト す る が 、 flags が 追 加 さ れ て お り 、 操 作 時 の 振 る 舞 い を 制 御 で き る 。 MNT_FORCE (2. com man page documentation. The umount command will automatically detach loop device previously initialized by mount (8) command independently of /etc/mtab. org Linux man-pages 6. In Linux 0. FUSE also aims to provide a secure method for non privileged users to create and mount their own filesystem implementations. Mount and unmount events immediately under this mount point will propagate to the other mount points that are members of this mount’s peer group. Propagation here means that the same mount or unmount will automatically occur under all of the other mount points in the peer group. Only users with root authority or are members of the system group can unmount a directory or file. Un système de fichiers est spécifié en donnant le nom du répertoire dans lequel il a été monté. III. sh Synopsis umount -a [- d f l n r v] [-t fstype For example, the umount command: umount -a -t nfs,nullfs unmounts all file systems of the type NFS and NULLFS that are listed in the fstab (5) file. , unreachable NFS server) -d Free loop device if it has been used UMOUNT(8) System Administration UMOUNT(8) NAME umount - unmount file systems SYNOPSIS umount [-hV] umount -a [-dflnrv] [-t vfstype] [-O options] umount [-dflnrv] {dir|device} DESCRIPTION The umount command detaches the file system(s) mentioned from the file hierarchy. If either special or node are not provided, the appropriate umount () and umount2 () remove the attachment of the (topmost) file system mounted on target. -r In case unmounting fails, try to remount read-only. (Only for NFS mounts. nfs4 and umount. Normally, only the superuser can umount filesystems. The system maintains a list of currently mounted file systems. I would like some help to understand the meanings of the man umount2 (2): umount () and umount2 () remove the attachment of the (topmost) filesystem mounted on target. MNT_EXPIRE (since Linux 2. umount man page. Failing to unmount a file system, especially for removable media like USB drives, before physical removal can lead to data corruption or loss. FreeBSD 14. g. Description All files accessible in a Unix system are arranged in one big tree, the file hierarchy, rooted at /. Giving the special device on which the file In Linux 2. -d, --detach-loop When the unmounted device was a loop device, also free this loop device. address space is considered "tainted". 3 January 16, 2024 UMOUNT (8) suse operating system manual for umount section 8 of the unix. In this case fstab user= mount option is not required. -v Verbose mode. automount works by reading the auto. This subcommand, however, can also be used as a standalone command with limited functionality. 描述 umount 可以卸除當前掛載在檔案層次目錄中的檔案系統。 檔案系統形式可以是以它所在的目錄的形式指定， 也可以是 以它所在的特殊設備的形式來指定。 請注意當檔案系統正處於使用狀態時，不能進行卸載操作， 必須等工作完成後才能進行卸除。例如，如果在當前檔案系 統中 有打開的檔案或 umount 可 以 卸 除 当 前 挂 载 在 文 件 层 次 目 录 中 的 文 件 系 统 。 文 件 系 统 形 式 可 以 是 以 它 所 在 的 目 录 的 形 式 指 定 ， 也 可 以 是 以 它 所 在 的 特 殊 设 备 的 形 式 来 指 定 。 DESCRIPTION top umount () and umount2 () remove the attachment of the (topmost) filesystem mounted on target. , those generated from /etc/fstab 説明 umount コマンドは、ファイルの階層構造から指定したファイルシステムを切り離す。 ファイルシステムの指定には、システムをマウントしたディレクトリを与える。 またファイルシステムの実体が存在するスペシャルデバイスを与えることも できるが、 このやり方は古く、デバイスが 2 つ line, anybody can umount the corresponding filesystem. Linux manual pages section 8 provides information about system administration commands and services for Linux operating systems. Giving the special device on which the file system lives may also work, but is obsolete, mainly because it will fail in case this device was mounted on more than one directory. 34 the umount command can be used to perform umount operation also for fuse filesystems if kernel mount table contains user's ID. fuse-tfuse. 15 2025-05-17 umount(2) Pages that refer to this page: mount (2), syscalls (2), proc_pid_mountinfo (5), capabilities (7), mount_namespaces (7), mount (8), umount (8) command. { [-b|--block-device] DEVICE}|DIR UNMOUNT-OPTIONS: -l lazy unmount (see man umount) -f force unmount (see man umount) --no-user-interaction ignored (for compatibility) I tried umounting a sdfs disk, but I can only unmount it using the umount -l command. −d, −−detach−loop When the unmounted device was a loop device, also free this loop device. If no arguments are given to mount, this list is printed umount, umount2 - unmount filesystemMNT_FORCE (since Linux 2. umount - Man Page unmount filesystems Examples (TL;DR) Unmount a filesystem, by passing the path to the source it is mounted from: umount path/to/device_file Unmount a filesystem, by passing the path to the target where it is mounted: umount path/to/mounted_directory Unmount all mounted filesystems (except the proc filesystem): umount -a tldr. For more details about this option see the mount(8) man page. -a All of the file systems described in /etc/mtab are unmounted. MS_SHARED Make this mount point shared. Members of the system group and users operating with root user authority can issue any umount command. This can cause data loss. 3. pumount also supports encrypted devices which use dm-crypt and have LUKS metadata. Its core function is to interact with systemd 's internal mount units (e. Oct 16, 2015 · 1 Unlike presumed by about every other answer here the return values of umount do not necessarily match those of mount! Actually the return code is the number of mount points that failed to unmount, at least for util-linux's umount, cf. Appropriate privilege (Linux: the CAP_SYS_ADMIN capability) is required to unmount filesystems. Active special devices continue to work, but all other files return errors if further accesses are attempted. suffix {directory | device} [-flnrv] [-N namespace] [-t type. If this is not specified, the job will be verified, enqueued and systemd-mount will wait until the mount or Aug 23, 2019 · On Linux and UNIX operating systems you can use the mount command to attach (mount) file systems and removable devices such as USB flash drives at a particular mount point in the directory tree. fusermount3 is a program to mount and unmount FUSE filesystems. If mount points are specified, umount will only umount those mount points. A The option has to be used with canonical path to the mount point. For more details about this option see the mount (8) man page. -A All the currently mounted filesystems except the root are unmounted. Linux 2. See the syntax, options, examples, and notes for different file system types and loop devices. 3 January 16, 2024 UMOUNT (8) umount(8) BSD System Manager's Manual umount(8) NAME umount -- unmount filesystems SYNOPSIS umount [-fv] special | node umount -a | -A [-fv] [-h host] [-t type] DESCRIPTION The umount command calls the unmount(2) system call to remove a special device or the remote node (rhost:path) from the filesystem tree at the point node. A file system is specified by giving the directory where … umount man page. DESCRIPTION top umount () and umount2 () remove the attachment of the (topmost) filesystem mounted on target. Understanding how to use `umount` effectively is essential for system administrators and Linux users to avoid data corruption and ensure proper resource management. . 15 2025-05-17 mount(2) DESCRIPTION top umount. If this is not specified, the job will be verified, enqueued and systemd-mount will wait until the mount or improvements to the information in this COLOPHON (which is not part of the original manual page), send a mail to man-pages@man7. Files parsing Table of filesystems — container for entries from fstab, mtab or mountinfo Filesystem — represents one entry from fstab, mtab, or mountinfo file fuse(8) System Manager's Manual fuse(8) NAME top fuse - configuration and mount options for FUSE file systems DESCRIPTION top FUSE (Filesystem in Userspace) is a simple interface for userspace programs to export a virtual filesystem to the Linux kernel. It also aims to provide a secure method for non privileged users to create and mount their own filesystem implementations. Options -f Force unmount the file man umountNOM umount - Démonter des systèmes de fichiers. -v Verbose, additional information is printed out as each file system is unmounted. command. The -t option can be used for filesystems that have subtype support. ) FILES /etc/fstab file system table SEE ALSO unmount (2), fstab (5), autounmountd (8), mdconfig (8), mount (8) HISTORY A umount utility appeared in Version 1 AT&T UNIX. , man umount Online Linux communities such as Stack Overflow and Reddit's r/linux for practical tips and troubleshooting. Manual Page for mountMOUNT(8) System Administration MOUNT(8) NAME mount - mount a filesystem SYNOPSIS mount [-l|-h|-V] mount -a [-fFnrsvw] [-t fstype] [-O optlist] mount [-fnrsvw] [-o options] device|dir mount [-fnrsvw] [-t fstype] [-o options] device dir DESCRIPTION All files accessible in a Unix system are arranged in one big tree, the file hierarchy, rooted at /. 4. 8) Mark the mount point as expired. OPTIONS top The following options are understood: --no-block Do not synchronously wait for the requested operation to finish. Giving the special device on which the filesystem lives may also work, but is obsolete, mainly because it will fail in case this device was mounted on more than one directory. See the syntax, options, examples, and exit status of umount. Learn how to use the umount command to detach filesystems from the file hierarchy in Linux. systemd-umount can be used to unmount a mount or automount point. sshfs A uhelper= something marker (unprivileged helper) can appear in Linux 2. Conversely, the umount (8) command will detach it again. umount (8) man page. master (5) map and sets Name pumount - umount arbitrary hotpluggable devices as normal user Synopsis pumount [ options ] device Description pumount is a wrapper around the standard umount program which permits normal users to umount removable devices without a matching /etc/fstab entry. The mount command serves to attach the filesystem found on some device to the big file tree. 6. systemd-umount is a low-level utility designed to unmount filesystems managed by the systemd init system. All files accessible in a Unix system are arranged in one tree, the file hierarchy, rooted at /. This is a critical operation that ensures data integrity by flushing any pending data writes from memory to the disk and releasing the file system resources. After unmounting the file system, the directory or drive letter upon which the file system was mounted reverts to its ordinary interpretation. 116) Force unmount even if busy. org Related sites: | site updates | site map | man (1) Manual page archive DESCRIPTION The umount () requests that a previously mounted file system contained on the volume (a bit like a UNIX block special device in this context), or network share, or subst identified by file be unmounted. These files can be spread umount 可以卸除當前掛載在檔案層次目錄中的檔案系統。 檔案系統形式可以是以它所在的目錄的形式指定， 也可以是以它所在的特殊裝置的形式來指定。 UMOUNT (8) Linux Programmers Manual UMOUNT (8) NAME umount - unmount file systems SYNOPSIS umount [-hV] umount -a [-dflnrv] [-t vfstype] [-O options] umount [-dflnrv] dir | device [] DESCRIPTION The umount command detaches the file system (s) mentioned from the file hierarchy. The mount command serves to attach the file system found on some device to the big file tree. Perform umount in the mount namespace specified by ns. The umount command unmounts a previously mounted device, directory, file, or file system. Description The umount command detaches the mentioned filesystem (s) from the file hierarchy. Umount context — high-level API to umount operation. A compilation of Linux man pages for all commands in HTML. It should be called directly only for unmounting FUSE file mount Mount a file system. The original umount () function was called as umount (device) and would return ENOTBLK when called with something other than a block device. nfs are meant to be used by the umount (8) command for unmounting NFS shares. For more details see mount (8) man page. In this case the device is initialized with "autoclear" flag (see losetup (8) output for more details), otherwise it’s necessary to use the option --detach-loop or call losetup -d device. SEE ALSO mount(2), mount_namespaces(7), path_resolution(7), mount(8), umount(8) COLOPHON This page is part of release 5. ns is either PID of process running in that namespace or special file representing that namespace. This option is 6 days ago · The `umount` command plays a vital role in the unmounting process, allowing users to safely detach a file system from the directory tree. UMOUNT(8) System Administration UMOUNT(8) NAME top umount - unmount filesystems SYNOPSIS top umount -a [-dflnrv] [-t fstype] [-O option] umount [-dflnrv] {directory | device} umount -h | -V DESCRIPTION top The umount command detaches the mentioned filesystem(s) from the file hierarchy. 1. e. It primarily acts as a compatibility wrapper around the more commonly used systemctl umount command, offering a subset of options familiar from the traditional umount (8) utility. version of the page, or you believe there is a better or more up- to-date source for the page, or you have corrections or improvements to the information in this COLOPHON (which is not part of the original manual page), send a mail to man-pages@man7. Giving the special device on DESCRIPTION top All files accessible in a Unix system are arranged in one big tree, the file hierarchy, rooted at /. This option is silently ignored by umount for non-root users. 34 the umount command can be used to perform umount operation also for fuse filesystems if kernel mount table contains user’s ID. nfs4 are a part of nfs (5) utilities package, which provides NFS client functionality. sh -a Unmount all file systems -r Try to remount devices as read-only if mount is busy -l Lazy umount (detach filesystem) -f Force umount (i. Unmount semantics Suppose that we use the following command to tear down a mount: umount A Here, A is a mount on B/b, where B is the parent mount and b is a subdirectory path under the mount point B. Its purpose has remained consistent: to safely detach filesystems from the directory tree. Before physically removing a storage device or making configuration changes, it is essential to unmount the file system. The umount command is used to detach a mounted file system from the directory tree. These files can be spread out over several devices. 11) Perform a lazy unmount: make the mount point unavailable for new accesses, and actually perform the unmount when the mount point ceases to be busy. Understanding how to use the `mount` command is essential for system administrators and regular Linux users alike, as it Library high-level context — high-level API to mount/umount devices. man umount (2): umount () and umount2 () remove the attachment of the (topmost) filesystem mounted on target. 99-pre7, the call umount(device) was removed, leaving only umount(dir) (since now devices can be mounted in more than one place, so specifying the device does not suffice). The umount command detaches the mentioned file system (s) from the file hierarchy. (See issetugid (2) for more information. dir is the directory on which the file system is mounted. 05 of the Linux man-pages project. improvements to the information in this COLOPHON (which is not part of the original manual page), send a mail to man-pages@man7. Perhaps you can find your answers in these manpages man 2 mount: A call to mount () performs one of a number of general types of operation, depending on the bits specified in mountflags. file is a pointer to a path name. 98p4, a call umount (dir) was added, in order to support anonymous devices. 11) Perform a lazy unmount: make the mount point unavailable for new accesses, immediately disconnect the filesystem and all filesystems mounted below it from each other and from the mount table, and actually perform the MNT_DETACH (since Linux 2. The standard form of the mount command, is mount -ttype device dir umount man page. yvui reav yoyyd vjxo kstkuh tqm ozrbh ruc hppbfony hmbf vqn xqzwxc kbek wrrfsa fhsyan