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User addition utility. More information: <https://manpages.debian.org/latest/adduser/adduser.html>.

Tool to perform basic numeric, textual and statistical operations on input textual data files. More information: <http://www.gnu.org/software/datamash/>.

A audio/video player based on MPlayer. More information: <https://mpv.io>.

Creates aliases -- words that are replaced by a command string. Aliases expire with the current shell session unless defined in the shell's configuration file, e.g. ~/.bashrc. More information: <https://tldp.org/LDP/abs/html/aliases.html>.

Run a command with a time limit. More information: <https://www.gnu.org/software/coreutils/timeout>.

Send email. More information: <https://manned.org/sendmail>.

Create or update the database used by locate. It is usually run daily by cron. More information: <https://manned.org/updatedb>.

Run, monitor and restart SSH connections. Auto-reconnects to keep port forwarding tunnels up. Accepts all ssh flags. More information: <https://www.harding.motd.ca/autossh>.