apropos

Shell:~/tmp >: man apropos

APROPOS(1)                 OpenBSD Reference Manual                 APROPOS(1)

NAME
     apropos - locate commands by keyword lookup

SYNOPSIS
     apropos [-C file] [-M path] [-m path] keyword ...

DESCRIPTION
     apropos shows which manual pages contain instances of any of the given
     keyword(s) in their title line.  Each word is considered separately and
     case of letters is ignored.  Words which are part of other words are con-
     sidered; when looking for ``compile'', apropos will also list all in-
     stances of ``compiler''.

     If the line output by apropos starts ``name (section) ...'', you can en-
     ter ``man section name'' to get its documentation.

 

unix-center.net:~ >: man apropos
apropos(1)                                                          apropos(1)



NAME
       apropos - search the whatis database for strings

SYNOPSIS
       apropos keyword ...

DESCRIPTION
       apropos searches a set of database files containing short descriptions of system commands for keywords and
       displays the result on the standard output.

AUTHOR
       John W. Eaton was the original author of man.  Zeyd M. Ben-Halim released man  1.2,  and  Andries  Brouwer
       followed  up  with  versions  1.3 thru 1.5p.  Federico Lucifredi <flucifredi@acm.org> is the current main-
       tainer.

竟然一直不知道有这个命令，以前就知道man -k了，以后也要记得还有whatis, whereis.