touch (create empty files) in Linux CLI - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the touch command do in Linux?

The touch command creates an empty file if it does not exist or updates the file's last modified time if it does exist.

beginner

How do you create multiple empty files at once using touch?

You list all the file names separated by spaces after touch. For example: touch file1.txt file2.txt file3.txt creates three empty files.

beginner

What happens if you use touch on a file that already exists?

The file's last access and modification timestamps are updated to the current time, but the file content stays the same.

intermediate

How can you use touch to create a file with a specific timestamp?

Use the -t option followed by the timestamp in the format [[CC]YY]MMDDhhmm[.ss]. For example: touch -t 202401011200 file.txt sets the file's timestamp to Jan 1, 2024, 12:00.

beginner

Why might you use touch in scripting or automation?

You can create placeholder files, update timestamps to trigger other processes, or ensure files exist before running commands that need them.

What does the command touch newfile.txt do if newfile.txt does not exist?

A Renames newfile.txt

B Deletes newfile.txt

C Displays the contents of newfile.txt

D Creates an empty file named newfile.txt

touch creates an empty file if it does not exist.

If file.txt exists, what does touch file.txt do?

A Updates the file's last modified time

B Deletes the file

C Changes file permissions

D Copies the file

touch updates the file's timestamps without changing its content.

How can you create three empty files named a.txt, b.txt, and c.txt in one command?

A rm a.txt b.txt c.txt

B touch a.txt b.txt c.txt

C mkdir a.txt b.txt c.txt

D cat a.txt b.txt c.txt

Listing multiple file names after touch creates all of them.

Which option with touch lets you set a custom timestamp?

A -c

B -r

C -t

D -a

The -t option sets a specific timestamp for the file.

Why might a script use touch before running another command?

A To create or update files needed by the command

B To delete files

C To change file ownership

D To compress files

touch ensures files exist or updates timestamps to trigger other actions.

Explain how the touch command works and give two common uses.

Think about creating files and changing file times.

Describe how to use touch to set a file's timestamp to a specific date and time.

Look for the option that controls time.