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OSXFAQ Mac OS X UNIX Tip-of-the-Day

Week 102 - Unix Commands Reference II (21 March 2005)

by Adrian Mayo - Editor, OSXFAQ

Wednesday - Useful Utility Commands

man ... the Unix manual
Option -k to search the manual
Option -f to report a one-line summary of a command

apropos ... the equivalent of man -k
This and 'man -k' search for the given command as a string and will display all manual entries containing the string

whatis ... the equivalent of man -f
This and 'man -f' search for the given command as a whole word

makewhatis ... (re)build the whatis database

(See weekly tips weeks 2 and 20)

catman ... create formatted version of man pages
This speeds up the 'man' command.

info ... the GNU on-line manual
Try 'info info' for more details
Try 'info command-name' for information on the (GNU) command

at ... execute a command at a specific time

atq ... list the pending 'at' jobs

atrm ... remove an 'at' job form the queue

atrun ... the daemon that launches 'at' jobs
This should be added to the system crontab and run periodically (say every 5 minutes) to schedule 'at' jobs.

calendar ... scheduling and reminder service

(See tips week 41)

cron ... system task scheduling daemon

crontab ... user task scheduling daemon

(See tips week 33)

leave ... remind you when it's time to leave
Do we need reminding of this? :-)
(See tips wee w95 - Wednesday)

banner ... write banner text to a printer

bc ... an arbitrary precision calculator

dc ... an arbitrary precision reverse polish calculator

cal ... display a monthly, yearly calendar
Option -j displays day numbers

units ... convert quantities from one units system to another

(See tips week 6)

Discuss this trick in the Learning Center forum

If you want to learn more about Mac OS X Unix visit the Learning Center click.

For beginners: Mac OS X Unix Tutorials
For detailed information on specific topics: Advanced Unix
For OS X in gereral: Mac OS X Tutorials


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