umount Command

umount [OPTIONS] directory|device umount [OPTIONS] -a

# Unmount by mount point umount /mnt/usb umount /media/cdrom umount /home # Unmount with verbose output umount -v /mnt/backup # Check what's mounted first mount | grep /mnt/usb umount /mnt/usb

# Unmount by device name umount /dev/sdb1 umount /dev/sdc1 umount /dev/loop0 # Unmount USB devices umount /dev/sdb1 # Unmount CD/DVD umount /dev/sr0 # List mounted devices first lsblk umount /dev/sdb1

# Unmount multiple mount points umount /mnt/usb1 /mnt/usb2 /mnt/backup # Unmount all removable media umount /media/* # Unmount all filesystems of specific type umount -a -t vfat umount -a -t ntfs # Unmount all except essential filesystems umount -a -t noext4,noext3,noxfs

# Try to unmount umount /mnt/data # Error: umount: /mnt/data: target is busy # Find processes using the filesystem lsof /mnt/data fuser -v /mnt/data # Find processes with current directory in filesystem fuser -c /mnt/data # Show detailed process information lsof +D /mnt/data # Kill processes using the filesystem fuser -k /mnt/data # Then try unmounting again umount /mnt/data

# Lazy unmount (detach immediately, cleanup later) umount -l /mnt/data # Force unmount (mainly for NFS) umount -f /mnt/nfs # Combine lazy and force umount -fl /mnt/problematic # Remount read-only if unmount fails umount -r /mnt/data # Kill processes and unmount fuser -km /mnt/data umount /mnt/data

#!/bin/bash # Safe unmount script MOUNT_POINT="/mnt/external" # Check if mounted if ! mountpoint -q "$MOUNT_POINT"; then echo "Not mounted: $MOUNT_POINT" exit 0 fi # Sync data sync # Try normal unmount if umount "$MOUNT_POINT" 2>/dev/null; then echo "Successfully unmounted: $MOUNT_POINT" exit 0 fi # Find what's using it echo "Filesystem busy. Processes using $MOUNT_POINT:" lsof +D "$MOUNT_POINT" 2>/dev/null || fuser -v "$MOUNT_POINT" 2>/dev/null # Ask user for action read -p "Kill processes and unmount? (y/N): " -n 1 -r echo if [[ $REPLY =~ ^[Yy]$ ]]; then fuser -k "$MOUNT_POINT" sleep 2 umount "$MOUNT_POINT" fi

# Unmount NFS shares umount /mnt/nfs-share # Force unmount unresponsive NFS umount -f /mnt/nfs-share # Unmount CIFS/SMB shares umount /mnt/smb-share # Unmount SSHFS umount /mnt/sshfs fusermount -u /mnt/sshfs # Alternative for FUSE # Unmount all NFS mounts umount -a -t nfs,nfs4

# Unmount loop devices umount /mnt/iso losetup -d /dev/loop0 # Detach loop device # Unmount encrypted filesystems umount /mnt/encrypted cryptsetup luksClose encrypted-volume # Unmount bind mounts umount /mnt/bind-mount # Unmount tmpfs umount /mnt/tmpfs # Unmount FUSE filesystems fusermount -u /mnt/fuse-mount

# Unmount USB drives umount /media/usb umount /dev/sdb1 # Unmount CD/DVD umount /media/cdrom eject /dev/sr0 # Eject after unmount # Unmount SD cards umount /media/sdcard # Safe removal of USB device sync # Flush buffers umount /dev/sdb1 eject /dev/sdb # Safe to remove # Unmount all removable media for mount in /media/*; do [ -d "$mount" ] && umount "$mount" 2>/dev/null done

# Unmount for filesystem check umount /dev/sdb1 fsck /dev/sdb1 mount /dev/sdb1 /mnt/data # Unmount for backup umount /home dd if=/dev/sda2 of=/backup/home.img mount /home # Unmount before system shutdown umount -a -r # Remount all read-only # Emergency unmount all umount -a -f -l

#!/bin/bash # Backup script with unmounting BACKUP_MOUNT="/mnt/backup" BACKUP_DEVICE="/dev/sdc1" # Mount backup drive mount "$BACKUP_DEVICE" "$BACKUP_MOUNT" # Perform backup rsync -av /home/ "$BACKUP_MOUNT/home-backup/" # Sync and unmount sync umount "$BACKUP_MOUNT" echo "Backup completed and drive unmounted" # Cleanup script for development cleanup_mounts() { local mounts=("/mnt/test1" "/mnt/test2" "/mnt/temp") for mount in "${mounts[@]}"; do if mountpoint -q "$mount"; then echo "Unmounting $mount" umount "$mount" || umount -l "$mount" fi done }

# Check what's mounted mount | grep /mnt/data mountpoint /mnt/data # Check filesystem usage lsof +D /mnt/data fuser -v /mnt/data # Check mount options mount | grep /mnt/data cat /proc/mounts | grep /mnt/data # Check for errors dmesg | tail -20 journalctl -f # Verify device status lsblk blkid /dev/sdb1 # Check filesystem health fsck -n /dev/sdb1 # Read-only check

# Force unmount stuck NFS umount -f -l /mnt/nfs # Recover from failed unmount mount -o remount,ro /mnt/data # Remount read-only sync umount /mnt/data # Clear stale file handles echo 3 > /proc/sys/vm/drop_caches umount /mnt/data # Emergency remount root read-only mount -o remount,ro / # Fix corrupted mount table grep -v /mnt/problematic /etc/mtab > /tmp/mtab mv /tmp/mtab /etc/mtab