What does the mount command do in Linux?

The mount command attaches a filesystem (from a device like a hard drive partition or USB stick, or a network share) to a specified directory (mount point) in the Linux filesystem tree, making its contents accessible.

How do I mount a USB drive in Linux?

First, identify the device (e.g., /dev/sdb1) using 'lsblk'. Then create a mount point (e.g., 'sudo mkdir /mnt/usb') and mount it: 'sudo mount /dev/sdb1 /mnt/usb'.

How do I unmount a filesystem?

Use the 'umount' command followed by the mount point or device name. For example: 'sudo umount /mnt/usb' or 'sudo umount /dev/sdb1'.

mount Command

The mount command in Linux is used to attach a filesystem to a specified mount point (a directory) in the filesystem tree. This makes the files and directories on the storage device accessible to the operating system and users. It's a crucial command for interacting with various storage media, including hard drives, SSDs, USB drives, CD/DVD-ROMs, and network shares.

Syntax

mount [-t type] [-o options] device directory

Description

When a filesystem is mounted, the contents of the device become accessible through the mount point. The mount command essentially tells the operating system that the filesystem on a particular device is available at a specific location in the directory hierarchy. Conversely, umount detaches the filesystem.

Common uses include:

Mounting removable media (USB drives, external hard drives).
Mounting partitions of internal hard drives.
Mounting network filesystems (NFS, SMB/CIFS).
Making ISO images accessible as virtual disks.

Common Options

Option	Description
`-a, --all`	Mount all filesystems mentioned in `/etc/fstab`.
`-t, --types <type>`	Specify the filesystem type (e.g., ext4, vfat, ntfs, nfs).
`-o, --options <options>`	Specify mount options (e.g., ro, rw, noexec, loop).
`-r, --read-only`	Mount the filesystem as read-only.
`-w, --read-write`	Mount the filesystem as read-write (default).
`-L <label>`	Mount the partition that has the specified label.
`-U <uuid>`	Mount the partition that has the specified UUID.

Examples

Mount a USB drive

                        sudo mkdir /mnt/usb_drive

                        sudo mount /dev/sdb1 /mnt/usb_drive

Creates a mount point and mounts the first partition of a USB drive.

Mount an ISO image

                        sudo mkdir /mnt/iso

                        sudo mount -o loop my_image.iso /mnt/iso

Mounts an ISO file as a loop device, making its contents accessible.

Mount a network file system (NFS) share

                        sudo mkdir /mnt/nfs_share

                        sudo mount -t nfs 192.168.1.100:/shared_folder /mnt/nfs_share

Mounts an NFS share from a remote server.

Remount a filesystem as read-only

sudo mount -o remount,ro /dev/sda1

Changes an already mounted filesystem to read-only mode.

List all mounted filesystems

Displays a list of all currently mounted filesystems.