Full text search for man pages `apropos` works great for searching manual page names and descriptions. Is there a similar command for searching the entire contents of the manual pages?

By using the command man man we can see that we have two options.


-k Equivalent to apropos.

-K Search for the specified string in *all* man pages. Warning:
this is probably very slow! It helps to specify a section.
(Just to give a rough idea, on my machine this takes about a
minute per 500 man pages.)


This is on a RHEL 5 system