http://www.nongnu.org/man-db/
The man-db package includes five tools for browsing man-pages:
man, whatis, apropos, manpath and lexgrog. man formats and displays
manual pages. whatis searches the manual page names. apropos searches the
manual page names and descriptions. manpath determines search path
for manual pages. lexgrog directly reads header information in
manual pages.
General Commands | Command | Description | | apropos | search the manual page names and descriptions |
| lexgrog | parse header information in man pages |
| man | an interface to the on-line reference manuals |
| manconv | convert manual page from one encoding to another |
| manpath | determine search path for manual pages |
| whatis | display one-line manual page descriptions |
System Administration | Command | Description | | accessdb | dumps the content of a man-db database in a human readable format |
| catman | create or update the pre-formatted manual pages |
| mandb | create or update the manual page index caches |