man man_pagewhere man_page is either a command, or a special file. man then displays documentation on the standard output, one screenful at a time. To see the next screenful, press the space bar (man works very similarly to the more command with a reduced functionality).
man -k key_word
key_word is a keyword that is found in the description of a man_page. When
man -k key_wordis issued, all commands which will be listed contain in their description, the word key_word.
man pages are typically divided into eight sections; some Linux distributions may have a 9th one, specifically for kernel routines (very rarely used; its man pages even say section 9 is "obsolete"!).
The following table illustrates most man page sections on a Sun (mostly Berkeley based), on a Silicon Graphics (System V based) system, and on the SuSE 7.3 and Red-Hat 7.2 linux distribution:
Table content based on [4, p. 56].