chown (change ownership) in Linux CLI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to change the owner of the file example.txt to user alice.

Linux CLI

chown [1] example.txt

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

A-R

Balice

Croot

Dexample.txt

Attempts:

3 left

💡 Hint

Common Mistakes

Using the filename as the owner.

Using flags like -R instead of the owner name.

The chown command changes the owner of a file. To set the owner to alice, you write chown alice filename.

2fill in blank

medium

Complete the command to change the owner of the directory docs and all its contents recursively to user bob.

Linux CLI

chown [1] bob docs

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

A-R

B-v

C-f

D-h

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting the recursive flag and only changing the directory itself.

Using flags that do not affect recursion.

The -R flag tells chown to apply changes recursively to all files and subdirectories inside docs.

3fill in blank

hard

Fix the error in the command to change the owner of file.txt to user carol.

Linux CLI

chown carol [1]

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

Afile.txt

Bdocs

C-R

Dcarol

Attempts:

3 left

💡 Hint

Common Mistakes

Using a flag instead of the filename.

Repeating the owner name instead of the filename.

The filename file.txt must come after the owner name to specify which file's ownership to change.

4fill in blank

hard

Fill both blanks to change the owner to dave and the group to staff for the file report.txt.

Linux CLI

chown [1]:[2] report.txt

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

Adave

Bstaff

Cusers

Dadmin

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping owner and group positions.

Using incorrect group names.

To change both owner and group, use owner:group syntax. Here, owner is dave and group is staff.

5fill in blank

hard

Fill all three blanks to recursively change the owner to eve, the group to developers for the directory project.

Linux CLI

chown [3] [1]:[2] project

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

A-v

Bdevelopers

C-R

Deve

Attempts:

3 left

💡 Hint

Common Mistakes

Placing flags in the wrong order.

Forgetting the recursive flag.

Mixing up owner and group names.

Use -R for recursive. Owner and group go as owner:group. The recursive flag should come before the directory name.

Practice

1. What does the chown command do in Linux?

easy

A. Deletes a file or directory

B. Changes the owner of a file or directory

C. Changes the permissions of a file or directory

D. Copies a file or directory

Solution

1. Step 1: Understand the purpose of chown

   The chown command is used to change the ownership of files or directories in Linux.

2. Step 2: Compare with other commands

   Changing permissions is done with chmod, deleting with rm, and copying with cp. So these are not correct.

3. Final Answer:

   Changes the owner of a file or directory -> Option B

4. Quick Check:

   chown changes ownership [OK]

Hint: Remember: chown = change owner [OK]

Common Mistakes:

• Confusing chown with chmod
• Thinking chown deletes files
• Mixing chown with copy commands

2. Which of the following is the correct syntax to change the owner of a file named file.txt to user alice?

easy

A. chown -owner alice file.txt

B. chown file.txt alice

C. chown alice file.txt

D. chown -u alice file.txt

Solution

1. Step 1: Recall the basic syntax of chown

   The correct syntax is chown USER FILE, so the user comes first, then the file.

2. Step 2: Check each option

   chown alice file.txt matches the syntax. Options A, B, and C use incorrect order or invalid flags.

3. Final Answer:

   chown alice file.txt -> Option C

4. Quick Check:

   Syntax: chown USER FILE [OK]

Hint: User name comes before file name in chown [OK]

Common Mistakes:

• Swapping user and file order
• Using invalid flags like -u or -owner
• Forgetting to specify the user

3. What will be the output of the command ls -l file.txt after running chown bob file.txt assuming file.txt was owned by user alice before?

medium

A. -rw-r--r-- 1 bob users 0 Apr 1 12:00 file.txt

B. -rw-r--r-- 1 alice users 0 Apr 1 12:00 file.txt

C. chown: invalid user: 'bob'

D. Permission denied

Solution

1. Step 1: Understand what chown bob file.txt does

   This command changes the owner of file.txt to user bob.

2. Step 2: Predict the ls -l output

   The owner field will show bob instead of alice. Permissions and group remain the same.

3. Final Answer:

   -rw-r--r-- 1 bob users 0 Apr 1 12:00 file.txt -> Option A

4. Quick Check:

   Owner changes to bob after chown [OK]

Hint: ls -l shows updated owner after chown [OK]

Common Mistakes:

• Expecting group to change automatically
• Thinking ownership stays the same
• Assuming error if user exists

4. You run chown alice file.txt but get the error: chown: changing ownership of 'file.txt': Operation not permitted. What is the most likely cause?

medium

A. You are not running the command as root or with sudo

B. The file file.txt does not exist

C. The username alice does not exist

D. The file is already owned by alice

Solution

1. Step 1: Understand permission requirements for chown

   Changing ownership usually requires root privileges or sudo because normal users cannot change file owners.

2. Step 2: Analyze the error message

   "Operation not permitted" means permission denied, not file missing or user missing.

3. Final Answer:

   You are not running the command as root or with sudo -> Option A

4. Quick Check:

   chown needs root privileges [OK]

Hint: Use sudo with chown to avoid permission errors [OK]

Common Mistakes:

• Ignoring need for root privileges
• Assuming file or user missing causes this error
• Trying to chown without sudo

5. You want to change the owner to carol and the group to staff for all files and folders inside /data/project recursively. Which command should you use?

hard

A. chown -r carol:staff /data/project

B. chown carol staff /data/project -R

C. chown carol:staff /data/project

D. chown -R carol:staff /data/project

Solution

1. Step 1: Understand recursive ownership change

   The -R option applies ownership changes to all files and folders inside the given directory recursively.

2. Step 2: Check correct syntax for user and group

   Use user:group format to set both owner and group at once.

3. Step 3: Verify options order and spelling

   chown -R carol:staff /data/project uses -R correctly and the right syntax. chown carol staff /data/project -R has wrong order and missing colon. chown carol:staff /data/project misses recursive flag. chown -r carol:staff /data/project uses lowercase -r which is invalid.

4. Final Answer:

   chown -R carol:staff /data/project -> Option D

5. Quick Check:

   Use -R and user:group for recursive ownership [OK]

Hint: Use -R and user:group to change ownership recursively [OK]

Common Mistakes:

• Forgetting the -R flag for recursion
• Using lowercase -r instead of -R
• Separating user and group without colon
• Placing options after the path