df (disk free space) in Linux CLI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to show disk free space in human-readable format.

Linux CLI

df [1]

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

A-h

B-a

C-l

D-t

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-a' which shows all filesystems but not human-readable sizes.

Using '-l' which limits output to local filesystems.

Using '-t' which filters by filesystem type.

The '-h' option makes the output human-readable by showing sizes in KB, MB, or GB.

2fill in blank

medium

Complete the command to display disk free space for the root directory only.

Linux CLI

df [1] /

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

A-h

B-T

C-i

D-x

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-T' which shows filesystem type but not human-readable sizes.

Using '-i' which shows inode information instead of disk space.

Using '-x' which excludes filesystem types.

The '-h' option shows the sizes in a human-readable format for the specified directory '/' (root).

3fill in blank

hard

Fix the error in the command to show disk free space with filesystem type included.

Linux CLI

df [1]

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

A-t

B-hT

C-T

D-i

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-hT' which shows both human-readable sizes and filesystem type.

Using '-t' which filters by filesystem type instead of showing it.

Using '-i' which shows inode info, not filesystem type.

The '-T' option shows the filesystem type in the output.

4fill in blank

hard

Fill the blanks to show disk free space excluding temporary filesystems and in human-readable format.

Linux CLI

df [1] [2] [3]

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

A-h

B-x

Ctmpfs

D-T

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-T' which shows filesystem type but does not exclude anything.

Using 'tmpfs' as an option instead of a value for '-x'.

Use '-h' for human-readable sizes and '-x tmpfs' to exclude tmpfs filesystems.

5fill in blank

hard

Fill all three blanks to create a dictionary of mount points and their used space in human-readable form.

Linux CLI

df -h | awk '{{print $[1], $[2]' | while read [3] used; do echo "$used on $[3]"; done

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

A6

B3

Cmount

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up column numbers for mount point and used space.

Using wrong variable names in the while loop.

Column 6 is the mount point, column 3 is used space, and 'mount' is the variable to read mount points.

Practice

1. What does the df command do in Linux?

easy

A. Shows disk free space on mounted filesystems

B. Displays running processes

C. Lists files in a directory

D. Shows network connections

Solution

1. Step 1: Understand the purpose of df

   The df command is used to report disk space usage on mounted filesystems.

2. Step 2: Compare with other commands

   Other options like listing processes or files are done by different commands like ps or ls.

3. Final Answer:

   Shows disk free space on mounted filesystems -> Option A

4. Quick Check:

   df = disk free space [OK]

Hint: Remember: df = disk free space quick check [OK]

Common Mistakes:

• Confusing df with ls or ps commands
• Thinking df shows network info
• Assuming df lists files

2. Which of these is the correct syntax to show disk space in human-readable format?

easy

A. df -r

B. df -h

C. df --list

D. df -x

Solution

1. Step 1: Identify the option for human-readable sizes

   The -h option in df shows sizes in easy units like MB, GB.

2. Step 2: Check other options

   Options like -r, --list, or -x do not provide human-readable output.

3. Final Answer:

   df -h -> Option B

4. Quick Check:

   -h means human-readable [OK]

Hint: Use -h for human-readable sizes with df [OK]

Common Mistakes:

• Using -r or -x instead of -h
• Forgetting the dash before h
• Trying --list which is invalid

3. What will be the output of the command df -h /home?

medium

A. Shows disk usage of the /home filesystem in human-readable format

B. Shows disk usage of the root filesystem

C. Shows all mounted filesystems in bytes

D. Shows network disk usage

Solution

1. Step 1: Understand the command arguments

   The command df -h /home checks disk space for the /home directory only, with human-readable sizes.

2. Step 2: Eliminate other options

   It does not show root filesystem unless /home is on root, nor does it show all filesystems or network usage.

3. Final Answer:

   Shows disk usage of the /home filesystem in human-readable format -> Option A

4. Quick Check:

   df -h /home = /home usage human-readable [OK]

Hint: Add path after df -h to check specific folder space [OK]

Common Mistakes:

• Assuming it shows all filesystems
• Confusing /home with root filesystem
• Expecting output in bytes without -h

4. You run df -h /nonexistent and get an error. What is the likely cause?

medium

A. You need root permissions to run df

B. The df command does not support -h option

C. The path /nonexistent does not exist or is not mounted

D. The disk is full

Solution

1. Step 1: Analyze the error cause

   Running df on a path that does not exist or is not mounted causes an error.

2. Step 2: Check other options

   df supports -h, does not require root, and disk full does not cause this error.

3. Final Answer:

   The path /nonexistent does not exist or is not mounted -> Option C

4. Quick Check:

   Invalid path = error [OK]

Hint: Check if path exists before using df on it [OK]

Common Mistakes:

• Thinking -h is unsupported
• Assuming root needed for df
• Confusing disk full with path error

5. You want to check disk space for all mounted filesystems but exclude the tmpfs type. Which command will do this?

hard

A. df -h --exclude tmpfs

B. df -h --exclude=tmpfs

C. df -h --ignore-type tmpfs

D. df -h -x tmpfs

Solution

1. Step 1: Identify the correct option to exclude filesystem type

   The -x option excludes a filesystem type in df. So df -h -x tmpfs excludes tmpfs.

2. Step 2: Verify other options

   Options like --exclude-type, --exclude, or --ignore-type are invalid for df.

3. Final Answer:

   df -h -x tmpfs -> Option D

4. Quick Check:

   -x excludes filesystem type [OK]

Hint: Use -x to exclude filesystem types in df [OK]

Common Mistakes:

• Using invalid options like --exclude-type
• Confusing exclude with ignore
• Forgetting dash before x