man in UNIX

The man command displays the online manual pages.
man [options] [ [section] subjects]

Options Usage
-Output is piped through the more command.
-FSearch the MANPATH directories.
-f filesDisplay a summary (one line) for each file.
-k keywordsDisplays the header lines that contain any of the keywords.
-M pathSearchs in the path instead of the MANPATH directories.
-tFormat the pages with troff.
-T macDisplay using mac.

man -f tech