cvs

The Concurrent Versions System, a powerful source-code management program.

info

The GNU Info system for online documentation.

locale

Print information about available locales.

logger

Send messages to system logs, usually via syslog(3).

lp, lpr

Spool files to a printer.

lpq

Show the list of print jobs in progress and waiting in the queue.

mail

Send electronic mail.

make

Control compilation and recompilation of files.

man

Print the online manual page(s) for commands, library functions, system calls, devices, file formats, and administrative commands.

scp

Secure remote copy of files.

ssh

Secure shell. Provide an encrypted connection between machines for program execution or interactive login.

uptime

Tell how long the system has been up, and show system load information.