mount and umount in Linux CLI - Mini Project: Build & Apply

Mount and Umount Drives Using Linux CLI

📖 Scenario: You have a USB drive that you want to access on your Linux system. To use it, you need to mount it to a folder. After using it, you will unmount it safely.

🎯 Goal: Learn how to mount a USB drive to a folder and then unmount it using Linux command line commands.

📋 What You'll Learn

Create a directory to use as a mount point

Use the mount command to mount the USB drive

Use the umount command to unmount the USB drive

Display the mount points before and after unmounting

💡 Why This Matters

🌍 Real World

Mounting and unmounting drives is a common task when using external storage devices like USB drives or external hard disks on Linux systems.

💼 Career

System administrators and developers often need to manage storage devices safely and efficiently using these commands.

1

Create a mount point directory

Create a directory called /mnt/usbdrive to use as the mount point for the USB drive.

Linux CLI

# Create the directory /mnt/usbdrive
# Your code here

Hint

Use the mkdir command with the -p option to create the directory.

2

Mount the USB drive

Mount the USB drive device /dev/sdb1 to the directory /mnt/usbdrive using the mount command.

Linux CLI

mkdir -p /mnt/usbdrive
# Mount /dev/sdb1 to /mnt/usbdrive
# Your code here

Hint

Use mount /dev/sdb1 /mnt/usbdrive to mount the drive.

3

Check mounted drives

Use the mount command without arguments to list all mounted drives and verify that /dev/sdb1 is mounted on /mnt/usbdrive.

Linux CLI

mkdir -p /mnt/usbdrive
mount /dev/sdb1 /mnt/usbdrive
# List all mounted drives
# Your code here

Hint

Simply run mount to see all mounted drives.

4

Unmount the USB drive and verify

Use the umount command to unmount the USB drive from /mnt/usbdrive. Then run mount again to confirm it is no longer mounted.

Linux CLI

mkdir -p /mnt/usbdrive
mount /dev/sdb1 /mnt/usbdrive
mount
# Unmount /mnt/usbdrive
# List mounted drives again
# Your code here

Hint

Use umount /mnt/usbdrive to unmount, then mount to check.

Practice

1. What does the mount command do in Linux?

easy

A. It formats a storage device for use.

B. It connects a device or filesystem to a directory so you can access its files.

C. It disconnects a device from the system safely.

D. It lists all files in a directory.

Solution

1. Step 1: Understand the purpose of mount

   The mount command attaches a device or filesystem to a directory, making its files accessible.

2. Step 2: Differentiate from umount and other commands

   Umount disconnects devices, formatting prepares devices, and listing files is done by ls, not mount.

3. Final Answer:

   It connects a device or filesystem to a directory so you can access its files. -> Option B

4. Quick Check:

   Mount = Connect device to directory [OK]

Hint: Mount = connect device to folder, umount = disconnect [OK]

Common Mistakes:

• Confusing mount with umount
• Thinking mount formats devices
• Assuming mount lists files

2. Which of the following is the correct syntax to mount a device /dev/sdb1 to directory /mnt/usb?

easy

A. mount -u /dev/sdb1 /mnt/usb

B. mount /mnt/usb /dev/sdb1

C. umount /dev/sdb1 /mnt/usb

D. mount /dev/sdb1 /mnt/usb

Solution

1. Step 1: Recall mount command syntax

   The correct syntax is mount [device] [mount_point], so device first, then directory.

2. Step 2: Check options for correctness

   mount /dev/sdb1 /mnt/usb matches the syntax: mount /dev/sdb1 /mnt/usb. Others reverse order or use wrong command.

3. Final Answer:

   mount /dev/sdb1 /mnt/usb -> Option D

4. Quick Check:

   mount device directory = correct syntax [OK]

Hint: Device first, then directory in mount command [OK]

Common Mistakes:

• Swapping device and directory order
• Using umount instead of mount
• Adding wrong options like -u

3. What will be the output of the command sequence below if /dev/sdb1 is already mounted on /mnt/usb?

mount /dev/sdb1 /mnt/usb
mount | grep /mnt/usb

medium

A. /dev/sdb1 on /mnt/usb type ext4 (rw,relatime)

B. mount: /mnt/usb is busy

C. mount: /dev/sdb1 is already mounted

D. No output

Solution

1. Step 1: Understand mounting an already mounted device

   Running mount on an already mounted device usually remounts or shows no error, depending on system, but the second command lists mounts.

2. Step 2: Analyze the grep output

   The command mount | grep /mnt/usb shows the current mount info for that directory, typically like /dev/sdb1 on /mnt/usb type ext4 (rw,relatime).

3. Final Answer:

   /dev/sdb1 on /mnt/usb type ext4 (rw,relatime) -> Option A

4. Quick Check:

   mount | grep shows mount info [OK]

Hint: mount | grep shows current mounts [OK]

Common Mistakes:

• Expecting error when mounting already mounted device
• Confusing mount error messages
• Ignoring output of grep command

4. You try to unmount a device with umount /mnt/usb but get the error: umount: /mnt/usb: target is busy. What is the best way to fix this?

medium

A. Close any open files or terminals using /mnt/usb, then try umount again.

B. Force unmount with umount -f /mnt/usb immediately.

C. Reboot the system to clear the busy state.

D. Delete the /mnt/usb directory and try umount again.

Solution

1. Step 1: Understand 'target is busy' error

   This error means some process is using files or directories inside /mnt/usb, blocking unmount.

2. Step 2: Proper fix is to close those processes

   Close open files, terminals, or programs accessing /mnt/usb, then run umount again safely.

3. Final Answer:

   Close any open files or terminals using /mnt/usb, then try umount again. -> Option A

4. Quick Check:

   Busy means in-use; close files before umount [OK]

Hint: Close files using mount point before umount [OK]

Common Mistakes:

• Forcing unmount without checking usage
• Deleting mount directory instead of unmounting
• Rebooting unnecessarily

5. You want to write a script that mounts a USB device /dev/sdb1 to /mnt/usb, copies a file data.txt to it, then safely unmounts it. Which sequence of commands is correct?

hard

A. umount /mnt/usb && mount /dev/sdb1 /mnt/usb && cp data.txt /mnt/usb/

B. cp data.txt /mnt/usb/ && mount /dev/sdb1 /mnt/usb && umount /mnt/usb

C. mount /dev/sdb1 /mnt/usb && cp data.txt /mnt/usb/ && umount /mnt/usb

D. mount /mnt/usb /dev/sdb1 && cp data.txt /mnt/usb/ && umount /mnt/usb

Solution

1. Step 1: Mount device before copying files

   You must mount the device first to access its filesystem, so mount command comes first.

2. Step 2: Copy file then unmount safely

   After copying, unmount to safely disconnect device. The sequence is mount, copy, then umount.

3. Final Answer:

   mount /dev/sdb1 /mnt/usb && cp data.txt /mnt/usb/ && umount /mnt/usb -> Option C

4. Quick Check:

   Mount -> copy -> umount sequence [OK]

Hint: Mount first, copy files, then unmount [OK]

Common Mistakes:

• Copying files before mounting
• Unmounting before copying
• Swapping device and directory in mount