Keep a pipeline copy

Quest: keep-pipeline-copy

Mission

Extract login shells, save the stream with tee, and count its lines.

Commands You Will Use

• mkdir
• cut
• tee
• wc
• cat

This quest also uses pipe syntax.

Steps

1. Run mkdir -p ~/playground if the directory is missing.
2. Run cut -d: -f7 /etc/passwd | tee ~/playground/login-shells.txt | wc -l.
3. Run cat ~/playground/login-shells.txt and confirm it contains shell paths.
4. Ask the guide to check your work.

Hints

1. cut -d: -f7 selects the login-shell field.
2. tee copies stdin to the file and also sends it onward through stdout.
3. The exact pipeline and ~/playground/login-shells.txt are both checked.

If Check Fails

• If the command is missing, run the complete pipeline exactly as shown.
• If the file is missing or empty, run each stage alone, then reconnect the pipeline.
• If ~/playground is missing, create it with mkdir -p ~/playground.

Related Reading

• pipes
• tee
• cut
• wc