$ man ls
1. USER COMMANDS 2. SYSTEM CALLS 3. C LIBRARY FUNCTIONS 4. DEVICES AND NETWORK INTERFACES 5. FILE FORMATS 6. GAMES AND DEMOS 7. ENVIRONMENTS, TABLES, AND TROFF MACROS 8. MAINTENANCE COMMANDS 9. X WINDOW SYSTEM
$ man crontab $ man 5 crontab $ man -M /usr/local/rancid/share/man cloginrc $ groff -man -Tascii /usr/local/rancid/share/man/man1/clogin.1 | less $ zcat /usr/share/man/man1/cat.1.gz | groff -man -Tascii
$ whatis 2303 $ man -k password
NAME SYNOPSIS DESCRIPTION ENVIRONMENT EXIT STATUS SEE ALSO