chgrp (change group) in Linux CLI - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

What is the output of this chgrp command?

You have a file named report.txt owned by user alice and group staff. You run the command chgrp developers report.txt. What will be the group of report.txt after this command?

A The group changes to <code>developers</code>.

B The group remains <code>staff</code>.

C The command outputs an error: group 'developers' does not exist.

D The command outputs an error: permission denied.

💡 Hint

Think about what chgrp does and whether the group exists.

The chgrp command changes the group ownership of a file. If the group developers exists and you have permission, the file's group changes to developers.

💻 Command Output

intermediate

What error does this chgrp command produce?

You run the command chgrp admin secret.txt but you are not the owner of secret.txt and not root. What error message will you most likely see?

A chgrp: cannot find group 'admin'

B chgrp: changing group of 'secret.txt': Operation not permitted

C chgrp: file 'secret.txt' does not exist

D chgrp: invalid option -- 'a'

💡 Hint

Think about permission requirements for changing group ownership.

Only the file owner or root can change the group ownership. Without permission, chgrp returns 'Operation not permitted'.

📝 Syntax

advanced

Which chgrp command correctly changes group recursively?

You want to change the group of the directory project and all its files and subdirectories to team. Which command is correct?

A chgrp --recursive team project

B chgrp -R team project

C chgrp -r team project

D chgrp team -R project

💡 Hint

Check the correct option for recursive change in chgrp.

The correct options for recursive change are -R and --recursive. -r is not recognized.

🚀 Application

advanced

How to change group of multiple files using chgrp?

You have files file1.txt, file2.txt, and file3.txt. You want to change their group to editors in one command. Which command will do this?

A chgrp editors file1.txt; chgrp editors file2.txt; chgrp editors file3.txt

B chgrp editors *.txt

C chgrp editors file?.txt

D chgrp editors file1.txt file2.txt file3.txt

💡 Hint

Think about how chgrp accepts multiple files as arguments.

You can list multiple files separated by spaces in one chgrp command to change their group.

🧠 Conceptual

expert

What happens if you run chgrp with a non-existent group?

You run chgrp ghostgroup file.txt where ghostgroup does not exist on the system. What will happen?

A The command silently ignores the group and leaves the file unchanged

B The command changes the group to a default group

C The command fails with: chgrp: invalid group: ‘ghostgroup’

D The command changes the group to the current user's primary group

💡 Hint

Think about how chgrp validates group names.

If the group does not exist, chgrp returns an error indicating the group is invalid.