I have already described how to copy answers to the configuration questions for Debian packages, but there is an easier way to read and insert new values into the debconf database.
Perform simple incremental backup using rdiff-backup utility.
Make iptables configuration persistent using basic system utilities or a designated boot-time loader.
There are those rare situations where you do not know the public key that is required to verify repository signatures, but want to add repository and a public key used to sign it. Hopefully, there is an easy answer to that question.
Install and configure localepurge package which provides a fancy shell script to recover disk space used by useless localizations.
Install and configure Dashing with Icinga 2 to use external board for your Icinga2 instance.
Configure and enable command-line tab completion for known SSH hosts to ease day-to-day operations from personal notebook. You do need to configure or enable this on Debian based distributions, but it is good to know how to do this as you will never know when it will come in handy. This article is an extension of my previus article on how to add SSH menu to Unity launcher.
Use Content-Disposition HTTP response header to determine filename and use it to store downloaded file.
Delete Nextcloud bookmarks using API. Notice, data is paginated in this case, so this particar case is more interesting than regular add/remove operations.
Reset admin password on UniFi controller to access wireless configuration.