command-not-found.com
Install any command on any operating system.
supervisorctl
Supervisor is a client/server system that allows its users to control a number of processes on UNIX-like operating systems. Supervisorctl is the command-line client piece of the supervisor which provides a shell-like interface.
ldconfig
Configure symlinks and cache for shared library dependencies.
service
Manage services by running init scripts. The full script path should be omitted (/etc/init.d/ is assumed).
dash
Debian Almquist Shell. Modern POSIX-compliant implementation of `sh` (isn't Bash compatible).