This technique is very common. To be honest, it is more common than I initially thought, so I will show you how to create single shell script that will display, create or destroy temporary file system depending on the name used to execute it.
Configuring and using supplementary repositories requires APT public key management to validate Release file and downloaded packages.
Find symbolic link by a target name. It sounds simple and it definitely is.
Log dropped connections from iptables firewall using netfilter userspace logging daemon for further analysis and troubleshooting.
Calculate how fast data is copied to the specified directory to determine how long it would take finish the whole process.
Verify file integrity using GnuPG signature without touching your local GnuPG configuration.
Compute SHA message digest of a file to verify that its contents have not been altered.
Create shell script for a cron job with hidden debug information that will be shown only when execudted inside terminal.
Logrotate does not support hourly schedule, but this is an easy task to accomplish.
grep commands to search for directories that contain one or multiple files with particular content.