cp (copy files and directories) in Linux CLI - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the cp command do in Linux?

The cp command copies files or directories from one location to another.

beginner

How do you copy a file named file1.txt to file2.txt using cp?

Use the command: cp file1.txt file2.txt. This copies the contents of file1.txt into a new file called file2.txt.

beginner

What option do you use with cp to copy directories recursively?

Use the -r or --recursive option to copy directories and all their contents.

intermediate

What does the -i option do when used with cp?

The -i option asks for confirmation before overwriting an existing file.

intermediate

How can you preserve file attributes like timestamps and permissions when copying with cp?

Use the -p option to preserve the original file's mode, ownership, and timestamps.

Which cp option copies directories and their contents?

A -v

B -p

C -i

D -r

The -r option copies directories recursively, including all files inside.

What happens if you run cp file1.txt file2.txt and file2.txt already exists?

A It deletes <code>file1.txt</code>

B It merges the two files

C It overwrites <code>file2.txt</code> without asking

D It creates a backup automatically

By default, cp overwrites the destination file without asking.

Which option makes cp ask before overwriting files?

A -v

B -i

C -r

D -p

The -i option stands for interactive mode and asks before overwriting.

How do you copy a file and keep its original timestamps and permissions?

A cp -p

B cp -i

C cp -r

D cp -v

The -p option preserves file attributes like timestamps and permissions.

What does the -v option do when used with cp?

A Shows each file being copied

B Preserves file permissions

C Copies files faster

D Copies directories recursively

The -v option stands for verbose and shows the copy progress.

Explain how to copy a directory and all its contents to a new location using cp.

Think about how to include all files inside the directory.

Describe how to safely copy a file without accidentally overwriting an existing file.

This option asks you before replacing files.

Practice

1. What does the cp command do in Linux?

easy

A. Deletes files or directories permanently

B. Copies files or directories from one location to another

C. Moves files or directories to a new location

D. Lists files and directories in the current folder

Solution

1. Step 1: Understand the purpose of cp

   The cp command is used to copy files or directories, not to delete or move them.

2. Step 2: Compare with other commands

   Deleting is done by rm, moving by mv, and listing by ls. So cp copies files or directories.

3. Final Answer:

   Copies files or directories from one location to another -> Option B

4. Quick Check:

   cp = copy files/directories [OK]

Hint: Remember: cp = copy files or folders [OK]

Common Mistakes:

• Confusing cp with mv (move)
• Thinking cp deletes files
• Mixing cp with ls (list)

2. Which of the following is the correct syntax to copy a directory named docs and all its contents to backup?

easy

A. cp -r docs backup

B. cp -d docs backup

C. cp docs backup

D. cp -f docs backup

Solution

1. Step 1: Identify the option to copy directories recursively

   The -r option tells cp to copy directories and their contents recursively.

2. Step 2: Check other options

   -d is for preserving links, -f forces overwrite but doesn't copy directories recursively, and no option copies only files.

3. Final Answer:

   cp -r docs backup -> Option A

4. Quick Check:

   Use -r to copy folders [OK]

Hint: Use -r to copy folders and contents [OK]

Common Mistakes:

• Omitting -r when copying directories
• Using -d or -f incorrectly
• Assuming cp copies folders without options

3. What will be the output of the following commands if file1.txt exists and file2.txt also exists?

cp file1.txt file2.txt
cat file2.txt

medium

A. Both files will be merged and displayed

B. Error: file2.txt already exists, copy fails

C. file2.txt remains unchanged, contents of file1.txt not copied

D. Contents of file1.txt will overwrite file2.txt, then displayed

Solution

1. Step 1: Understand default behavior of cp

   By default, cp overwrites the destination file if it exists without warning.

2. Step 2: Analyze the commands

   cp file1.txt file2.txt copies file1.txt over file2.txt, replacing its contents. Then cat file2.txt shows the new contents (from file1.txt).

3. Final Answer:

   Contents of file1.txt will overwrite file2.txt, then displayed -> Option D

4. Quick Check:

   cp overwrites files by default [OK]

Hint: cp overwrites existing files unless told otherwise [OK]

Common Mistakes:

• Expecting error if destination exists
• Thinking files merge on copy
• Assuming cp refuses overwrite

4. You run cp -r myfolder backup/ but get an error: cp: omitting directory 'myfolder'. What is the likely cause?

medium

A. You used -r but the command was typed incorrectly

B. The destination folder 'backup/' does not exist

C. You forgot the -r option to copy directories

D. You ran cp without -r option on a directory

Solution

1. Step 1: Understand the error message

   The error 'omitting directory' happens when cp tries to copy a directory without the recursive -r option.

2. Step 2: Check the command given

   The question says you ran cp -r myfolder backup/ but error suggests -r was missing or command was different.

3. Final Answer:

   You forgot the -r option to copy directories -> Option C

4. Quick Check:

   Missing -r causes 'omitting directory' error [OK]

Hint: Always use -r to copy directories [OK]

Common Mistakes:

• Assuming destination folder missing causes this error
• Typing -r incorrectly but not noticing
• Ignoring error message meaning

5. You want to copy all files and folders from project/ to backup/, but only if the files in backup/ are older than those in project/. Which command achieves this?

hard

A. cp -ru project/ backup/

B. cp -r project/ backup/

C. cp -rf project/ backup/

D. cp -ri project/ backup/

Solution

1. Step 1: Understand the options

   -r copies directories recursively, -u copies only when source is newer than destination, -f forces overwrite, -i prompts before overwrite.

2. Step 2: Choose the correct combination

   To copy directories and update only newer files, use -ru. This copies recursively and updates only if source is newer.

3. Final Answer:

   cp -ru project/ backup/ -> Option A

4. Quick Check:

   Use -ru to copy recursively and update only newer files [OK]

Hint: Use -ru to copy folders and update only newer files [OK]

Common Mistakes:

• Using -r alone copies all files regardless of age
• Using -f overwrites without checking timestamps
• Using -i prompts but doesn't check file age