umount Command - Unmount Filesystems

The umount command is used to unmount filesystems that are currently mounted. It is commonly used to safely disconnect storage devices or partitions from the filesystem tree.

Syntax

umount [options] target

Examples

umount /mnt/usb

umount /dev/sdb1

umount -a

Notes

• Make sure no process is using the filesystem before unmounting, otherwise umount will fail.
• Use lsof or fuser to check which processes are using a mount point.
• Unmounting is necessary before removing external drives to prevent data loss.