rm (remove files) in Linux CLI - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the rm command do in Linux?

The rm command deletes files or directories from the file system permanently.

beginner

How do you remove a directory and all its contents using rm?

Use rm -r directory_name. The -r option means recursive, so it deletes the directory and everything inside it.

beginner

What does the -i option do with the rm command?

The -i option asks for confirmation before deleting each file. It helps prevent accidental deletion.

intermediate

Why should you be careful when using rm -rf /?

Because rm -rf / deletes all files and directories starting from the root, which can erase your entire system and cause it to stop working.

beginner

How can you remove multiple files at once with rm?

You can list multiple files separated by spaces, like rm file1.txt file2.txt file3.txt, and all will be deleted.

What does the command rm -r myfolder do?

A Creates a new folder named 'myfolder'

B Renames the folder 'myfolder'

C Moves 'myfolder' to another location

D Deletes the folder 'myfolder' and all its contents

The -r option means recursive deletion, so it removes the folder and everything inside.

Which option makes rm ask before deleting each file?

A -r

B -f

C -i

D -v

The -i option stands for interactive mode, prompting for confirmation.

What happens if you run rm file.txt?

A The file 'file.txt' is deleted

B The file 'file.txt' is copied

C The file 'file.txt' is renamed

D The file 'file.txt' is opened

The rm command deletes the specified file.

What does the -f option do with rm?

A Forces deletion without asking

B Finds files to delete

C Formats the disk

D Fixes file permissions

The -f option forces deletion and ignores warnings or errors.

Which command deletes multiple files at once?

A rm -r file1 file2 file3

B rm file1 file2 file3

C rm -i file1 file2 file3

D rm -v file1 file2 file3

Listing multiple files after rm deletes all those files.

Explain how to safely delete a directory and its contents using the rm command.

Think about recursive deletion and asking before deleting.

Describe the risks of using rm -rf / and why it should be avoided.

Consider what happens when you delete everything on your computer.

Practice

1. What does the rm command do in Linux?

easy

A. Deletes files or folders permanently

B. Copies files to another location

C. Lists files in a directory

D. Creates a new directory

Solution

1. Step 1: Understand the purpose of rm

   The rm command is used to remove files or directories permanently from the system.

2. Step 2: Compare with other commands

   Other commands like cp copy files, ls lists files, and mkdir creates directories, so they do not delete files.

3. Final Answer:

   Deletes files or folders permanently -> Option A

4. Quick Check:

   rm = delete files [OK]

Hint: Remember: rm means remove files permanently [OK]

Common Mistakes:

• Confusing rm with cp or mv
• Thinking rm moves files instead of deleting
• Assuming rm lists files

2. Which of the following is the correct syntax to remove a file named example.txt?

easy

A. rm -i example.txt example2.txt

B. rm -r example.txt

C. rm example.txt

D. rm -f

Solution

1. Step 1: Identify basic rm syntax

   The basic command to remove a single file is rm filename. Here, rm example.txt removes the file named example.txt.

2. Step 2: Understand option usage

   -r is for directories, -i asks for confirmation, and -f forces removal but needs a filename. rm example.txt is simplest and correct for a single file.

3. Final Answer:

   rm example.txt -> Option C

4. Quick Check:

   Basic rm syntax = rm filename [OK]

Hint: Use rm filename to delete one file simply [OK]

Common Mistakes:

• Using -r for files instead of directories
• Forgetting to specify filename
• Using -f without filename

3. What will happen if you run the command rm -i file1.txt file2.txt?

medium

A. Deletes both files without asking

B. Asks for confirmation before deleting each file

C. Deletes only file1.txt and ignores file2.txt

D. Shows an error because -i cannot be used with multiple files

Solution

1. Step 1: Understand the -i option

   The -i option makes rm ask for confirmation before deleting each file.

2. Step 2: Apply to multiple files

   When multiple files are listed, rm -i will ask for confirmation separately for each file before deleting.

3. Final Answer:

   Asks for confirmation before deleting each file -> Option B

4. Quick Check:

   -i means interactive confirmation [OK]

Hint: Use -i to confirm each file deletion [OK]

Common Mistakes:

• Thinking -i deletes without asking
• Believing -i works only for one file
• Assuming -i causes error with multiple files

4. You try to delete a directory named myfolder using rm myfolder but get an error. What is the correct fix?

medium

A. Use rm -r myfolder to remove the directory and its contents

B. Use rm -f myfolder to force delete the directory

C. Use rm -i myfolder to confirm deletion

D. Rename the directory before deleting

Solution

1. Step 1: Understand why error occurs

   By default, rm cannot delete directories without the -r (recursive) option.

2. Step 2: Use recursive option to delete directory

   Using rm -r myfolder deletes the directory and all files inside it.

3. Final Answer:

   Use rm -r myfolder to remove the directory and its contents -> Option A

4. Quick Check:

   Delete directory = rm -r [OK]

Hint: Use -r to delete folders recursively [OK]

Common Mistakes:

• Trying rm without -r on directories
• Using -f alone does not delete directories
• Thinking -i fixes directory deletion

5. You want to safely delete all files with extension .log in your current folder, but want to confirm each deletion. Which command should you use?

hard

A. rm -f *.log

B. rm -r *.log

C. rm *.log

D. rm -i *.log

Solution

1. Step 1: Identify the need for confirmation

   You want to confirm each file deletion, so the -i option is needed.

2. Step 2: Use wildcard for all .log files

   The pattern *.log matches all files ending with .log in the current folder.

3. Step 3: Combine options correctly

   Using rm -i *.log will ask for confirmation before deleting each .log file.

4. Final Answer:

   rm -i *.log -> Option D

5. Quick Check:

   Confirm each deletion = rm -i [OK]

Hint: Add -i to confirm each file deletion with wildcard [OK]

Common Mistakes:

• Using rm without -i deletes without confirmation
• Using -r unnecessarily for files
• Using -f forces deletion without asking