File system types (ext4, xfs) in Linux CLI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to create an ext4 file system on /dev/sdb1.

Linux CLI

mkfs.[1] /dev/sdb1

Drag options to blanks, or click blank then click option'

Afat32

Bxfs

Cext4

Dntfs

Attempts:

3 left

💡 Hint

Common Mistakes

Using mkfs.xfs instead of mkfs.ext4 for ext4 file system.

Using Windows file system types like ntfs or fat32.

The mkfs.ext4 command creates an ext4 file system on the specified device.

2fill in blank

medium

Complete the command to create an XFS file system on /dev/sdc1.

Linux CLI

mkfs.[1] /dev/sdc1

Drag options to blanks, or click blank then click option'

Axfs

Bext4

Cext3

Dbtrfs

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing ext4 and xfs commands.

Using mkfs.ext3 or mkfs.btrfs instead of mkfs.xfs.

The mkfs.xfs command formats the device with the XFS file system.

3fill in blank

hard

Fix the error in the command to create an ext4 file system on /dev/sdd1.

Linux CLI

mkfs.[1] /dev/sdd1

Drag options to blanks, or click blank then click option'

Axfs

Bext4

Cntfs

Dfat

Attempts:

3 left

💡 Hint

Common Mistakes

Using mkfs.xfs or mkfs.ntfs for ext4 file system creation.

Typing the wrong file system type after mkfs.

The correct command uses mkfs.ext4 to create an ext4 file system.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps device names to their file system types if the type is ext4.

Linux CLI

fs_map = {dev: fs for dev, fs in devices.items() if fs [1] [2]

Drag options to blanks, or click blank then click option'

A==

B'ext4'

C'xfs'

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '!=' instead of '==' in the condition.

Checking for 'xfs' instead of 'ext4'.

The dictionary comprehension filters devices where the file system type equals 'ext4'.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps uppercase device names to their file system types only if the type is xfs.

Linux CLI

fs_map = {{ [1]: [2] for [3], fs in devices.items() if fs == 'xfs' }}

Drag options to blanks, or click blank then click option'

Adev.upper()

Bfs

Cdev

Dfs.upper()

Attempts:

3 left

💡 Hint

Common Mistakes

Using fs.upper() as key instead of dev.upper().

Using dev instead of dev.upper() for keys.

Filtering for 'ext4' instead of 'xfs'.

The comprehension maps uppercase device names (dev.upper()) to their file system types (fs) for devices where fs is 'xfs'.

Practice

1. Which command is used to create an ext4 file system on a disk partition?

easy

A. format /dev/sdX1

B. mkfs.xfs /dev/sdX1

C. mkfs.ext4 /dev/sdX1

D. diskformat ext4 /dev/sdX1

Solution

1. Step 1: Understand the command for ext4 file system creation

   The command mkfs.ext4 is specifically designed to create ext4 file systems on a given partition.

2. Step 2: Identify the correct usage with device name

   Using mkfs.ext4 /dev/sdX1 formats the partition /dev/sdX1 as ext4.

3. Final Answer:

   mkfs.ext4 /dev/sdX1 -> Option C

4. Quick Check:

   ext4 creation command = mkfs.ext4 [OK]

Hint: ext4 uses mkfs.ext4 command to format partitions [OK]

Common Mistakes:

• Confusing mkfs.xfs with mkfs.ext4
• Using generic format commands not valid in Linux
• Trying to use unsupported commands like diskformat

2. Which of the following is the correct syntax to create an XFS file system on /dev/sdb1?

easy

A. mkfs.ext4 /dev/sdb1

B. mkfs.xfs /dev/sdb1

C. mkfs.xfs -t xfs /dev/sdb1

D. format xfs /dev/sdb1

Solution

1. Step 1: Identify the command for XFS file system creation

   The command mkfs.xfs is the standard way to create an XFS file system on a partition.

2. Step 2: Confirm the correct device usage

   Using mkfs.xfs /dev/sdb1 formats the partition /dev/sdb1 as XFS.

3. Final Answer:

   mkfs.xfs /dev/sdb1 -> Option B

4. Quick Check:

   XFS creation command = mkfs.xfs [OK]

Hint: Use mkfs.xfs for XFS file system creation [OK]

Common Mistakes:

• Using mkfs.ext4 instead of mkfs.xfs
• Trying mkfs.xfs -t xfs which is invalid syntax
• Using Windows-like format commands

3. What will be the output of the command file -s /dev/sdc1 after formatting /dev/sdc1 with ext4?

medium

A. /dev/sdc1: Linux rev 1.0 ext4 filesystem data

B. /dev/sdc1: XFS filesystem data

C. /dev/sdc1: data

D. /dev/sdc1: DOS/MBR boot sector

Solution

1. Step 1: Understand the file command with -s option

   The file -s command reads the device or file to identify its type.

2. Step 2: Recognize the output for ext4 formatted partition

   After formatting with ext4, the output shows Linux rev 1.0 ext4 filesystem data indicating ext4 file system.

3. Final Answer:

   /dev/sdc1: Linux rev 1.0 ext4 filesystem data -> Option A

4. Quick Check:

   file -s on ext4 = ext4 filesystem data [OK]

Hint: file -s shows filesystem type on device [OK]

Common Mistakes:

• Expecting XFS output after ext4 format
• Confusing raw data output with filesystem info
• Assuming DOS/MBR boot sector output on formatted partition

4. You ran mkfs.ext4 /dev/sdd1 but got an error: "device is mounted". What is the best fix?

medium

A. Unmount the device using umount /dev/sdd1 and retry

B. Use mkfs.xfs instead of ext4

C. Reboot the system and run the command again

D. Format a different device without unmounting

Solution

1. Step 1: Understand the error cause

   The error "device is mounted" means the partition is currently in use and cannot be formatted.

2. Step 2: Unmount the device before formatting

   Using umount /dev/sdd1 frees the device so mkfs.ext4 can run successfully.

3. Final Answer:

   Unmount the device using umount /dev/sdd1 and retry -> Option A

4. Quick Check:

   Unmount device before formatting = umount [OK]

Hint: Unmount device before formatting to avoid errors [OK]

Common Mistakes:

• Trying different filesystem without unmounting
• Rebooting unnecessarily instead of unmounting
• Ignoring the mounted status and forcing format

5. You need a file system for a large data server that requires fast write speed and supports files larger than 16TB. Which file system should you choose?

hard

A. ext4

B. NTFS

C. FAT32

D. XFS

Solution

1. Step 1: Analyze file system limits and performance

   ext4 supports large files but has a practical limit around 16TB; XFS supports very large files and is optimized for high-speed writes.

2. Step 2: Match requirements to file system features

   XFS is designed for large data servers with fast write speeds and supports files larger than 16TB, making it the best choice.

3. Final Answer:

   XFS -> Option D

4. Quick Check:

   Large fast files = XFS [OK]

Hint: Choose XFS for large files and fast writes on servers [OK]

Common Mistakes:

• Choosing ext4 without checking file size limits
• Selecting FAT32 which has small file size limits
• Confusing NTFS as a Linux-native file system