rm -r (remove directories) in Linux CLI - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

What is the output of this command?

You have a directory named testdir containing files and subdirectories. What happens when you run rm -r testdir?

Linux CLI

rm -r testdir

A The command deletes <code>testdir</code> but leaves subdirectories intact.

B The directory <code>testdir</code> and all its contents are deleted without any prompt.

C The command fails with an error because <code>rm</code> cannot remove directories.

D Only the files inside <code>testdir</code> are deleted, but the directory remains.

💡 Hint

Think about what the -r option means for rm.

The -r option tells rm to remove directories and their contents recursively. So the entire directory testdir and everything inside it is deleted.

💻 Command Output

intermediate

What error does this command produce?

You run rm -r mydir but get the error: rm: cannot remove 'mydir': Permission denied. What is the cause?

Linux CLI

rm -r mydir

A The directory <code>mydir</code> is empty, so <code>rm</code> refuses to delete it.

B The directory <code>mydir</code> does not exist.

C The <code>-r</code> option is invalid and causes an error.

D You do not have permission to delete <code>mydir</code> or its contents.

💡 Hint

Check the permissions of the directory and your user rights.

The error means your user account lacks the rights to delete the directory or some files inside it. You might need to use sudo or change permissions.

📝 Syntax

advanced

Which command correctly removes a directory named data and all its contents?

Choose the correct syntax to remove the directory data and everything inside it.

A rm -rf data

B rm data -r

C rm -r data

D rm --recursive data

💡 Hint

Consider the common options used with rm for recursive and forced deletion.

Option A uses -rf which means recursive and force deletion, a common and correct way to remove directories and contents without prompts.

Option A is valid but may prompt for confirmation if files are write-protected.

Option A is invalid syntax because options must come before arguments.

Option A is valid since --recursive is the long option equivalent to -r, but like C, may prompt for confirmation if files are write-protected.

🚀 Application

advanced

How to safely remove a directory only if it is empty?

You want to remove a directory named logs but only if it is empty. Which command should you use?

A rmdir logs

B rm -r logs

C rm logs

D rm -rf logs

💡 Hint

There is a command specifically designed to remove empty directories.

rmdir removes directories only if they are empty. If logs contains files, it will not delete and will show an error.

rm -r and rm -rf remove directories regardless of contents.

rm logs tries to remove a file, not a directory, and will fail.

🔧 Debug

expert

Why does this script fail to delete all directories?

Consider this bash script:

for d in */; do
  rm -r $d
  echo "Deleted $d"
done

It fails with errors when directory names contain spaces. What is the cause?

Linux CLI

for d in */; do
  rm -r $d
  echo "Deleted $d"
done

A The loop does not iterate over directories correctly because of the trailing slash.

B The rm command requires the -f option to force deletion.

C The variable $d is not quoted, so directories with spaces cause errors.

D The echo command syntax is incorrect and causes the script to fail.

💡 Hint

Think about how shell variables with spaces should be handled.

When directory names have spaces, using $d without quotes splits the name into parts, causing rm to fail. Quoting it as "$d" fixes the issue.

The trailing slash in */ is valid and helps select directories.

rm does not require -f here, and echo syntax is correct.