mount

mounting a FS means associate it to the linux tree, in a particular folder.

From man:

All files accessible in a Unix system are arranged in one big tree, the file hierarchy, rooted at /. These files can be spread out over sev‐ eral devices. The mount command serves to attach the filesystem found on some device to the big file tree.

 mkdir -p /mnt/test
 mount /dev/sdb1 /mnt/test
 cd /mnt/test/
 touch f1 f2 f3
 umount /mnt/test 
 mount /dev/sdb1 /mnt/test
 ls /mnt/test/


mount -a: mount all FS /etc/fstab 

• -r: ro
• -t ext4: specify FS ext type
• -L alabel: mount the FS matching the given label
• -U aUUID: mount the FS matching the given UUID

list mounted FS

mount -l 

mount options

mount -o auto

• remount
• ro
• rw
• loop: for loopback block device
• auto/noauto: auto mount the FS at startup or mount -a
• user: specify user allowed to mount/unmount the FS

mount FS in RO mode:

 mount -o ro /dev/sdb1 /mnt/test/
 ls /mnt/test/
 f1  f2 f3  lost+found
 date >> /mnt/test/f1
 -su: /mnt/test/f1: Read-only file system

remount it in RW mode (without unmount!):

 mount -o rw,remount /dev/sdb1 /mnt/test/
 date >> /mnt/test/f1

umount

umount /dev/sdb1

or

umount /mnt/test

• -a: all
• -f: forcee
• -r: if fails, remount in ro

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fstab

/etc/fstab is used to automount FS