Add an option to apropos to display only items matching all keywords

(thanks, Alfie Costa; Debian bug #259340).

* src/whatis.c (args, long_options, main): New -a/--and option for
  apropos.
  (usage): Document it.
  (apropos): Store a count of how many times each item has been seen
  in the hashtable. If --and was given, only display an item if its
  count equals the number of supplied keywords.
  (main): Store the number of supplied keywords. Adjust hash free
  function.
* man/man1/apropos.man1 (SYNOPSIS, OPTIONS): Document --and.
* docs/NEWS: Document this.

1 files changed, 3 insertions, 0 deletions

diff --git a/docs/NEWS b/docs/NEWS
index 80c8cf89..0862c784 100644
--- a/docs/NEWS
+++ b/docs/NEWS
@@ -51,6 +51,9 @@ Major changes since man-db 2.4.4:
 	o The output of apropos no longer includes duplicates when multiple
 	  search terms are used.
 
+	o apropos now accepts the --and option to display only items that
+	  match all the supplied keywords.
+
 man-db 2.4.4 (12 February 2007)
 ===============================