mountpoint

Check if a directory is a mountpoint

$ mountpoint [path/to/directory]

$ mountpoint -q [path/to/directory]

$ mountpoint -d [path/to/directory]

$ mountpoint -x [/dev/sda1]

mountpoint [-d|-q] directory|file
mountpoint -x device

mountpoint checks whether a given directory or file is a filesystem mountpoint by examining /proc/self/mountinfo. It is commonly used in shell scripts to verify mount status before performing operations.
The command returns exit code 0 if the path is a mountpoint, and exit code 32 if it is not. Exit code 1 indicates usage errors or system failures.

-d, --fs-devno

Display major/minor device numbers for the mounted filesystem

Suppress all output; use exit code only

Do not follow symbolic links at final path component

Output major/minor numbers for a block device

Display help and exit

Display version and exit

The command checks /proc/self/mountinfo, so results depend on the mount namespace of the calling process. Bind mounts may produce different results than expected. Setting LIBMOUNT_DEBUG=all enables debugging output.

mountpoint was originally part of sysvinit and is now maintained as part of util-linux by Karel Zak. It provides a reliable method for scripts to check mount status without parsing mount output.

mount(8), umount(8), findmnt(8)