tee for splitting output in Linux CLI - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the tee command do in Linux?

The tee command reads from standard input and writes the output to both standard output (screen) and one or more files at the same time.

beginner

How do you use tee to append output to a file instead of overwriting it?

Use the -a option with tee. For example: command | tee -a filename appends the output to filename.

beginner

Why is tee useful when running commands in the terminal?

tee lets you see the output on the screen and save it to a file at the same time. This is like watching a live TV show while recording it for later.

beginner

What happens if you run ls | tee file.txt?

The list of files from ls will be shown on the screen and also saved into file.txt. You get both at once.

intermediate

Can tee write to multiple files at once? How?

Yes. You can list multiple files after tee. For example: command | tee file1.txt file2.txt writes the output to both files and the screen.

What does the tee command do?

A Splits output to screen and file(s)

B Deletes files

C Changes file permissions

D Compresses files

tee sends output to both the screen and one or more files.

How do you append output to a file using tee?

A Use <code>-d</code> option

B Use <code>-o</code> option

C Use <code>-a</code> option

D Use <code>-r</code> option

The -a option appends output instead of overwriting.

Which command shows output on screen and saves it to log.txt?

A command | tee log.txt

B command > log.txt

C command >> log.txt

D tee command log.txt

Using tee after a pipe sends output to screen and file.

Can tee write to multiple files at once?

A No, it only writes to screen

B No, only one file at a time

C Yes, but only with <code>-m</code> option

D Yes, by listing files after <code>tee</code>

You can specify multiple files after tee to write output to all.

What will ls | tee file.txt do?

A Only save files to file.txt

B Show files on screen and save to file.txt

C Only show files on screen

D Delete file.txt

Output goes to both screen and file.txt with tee.

Explain how the tee command helps when you want to see command output and save it at the same time.

Think about watching and recording a live show.

Describe how to use tee to append output to a file and why this might be useful.

Appending is like adding pages to a notebook without erasing old pages.