remove dead code and the associated documentation

while here, remove the misleading shbang and an unused variable
and add the missing cross reference to ac(8)
ok sthen@ jmc@

src/etc/daily

@@ -1,12 +1,10 @@
-#!/bin/sh -
 #
-#	$OpenBSD: daily,v 1.56 2006/10/26 12:20:55 ajacoutot Exp $
+#	$OpenBSD: daily,v 1.57 2009/05/03 17:16:12 schwarze Exp $
 #	From: @(#)daily	8.2 (Berkeley) 1/25/94
 #
 umask 022
 
 PATH=/bin:/usr/bin:/sbin:/usr/sbin:/usr/local/bin
-bak=/var/backups
 
 sysctl -n kern.version
 uptime
@@ -58,26 +56,6 @@ if [ -d /var/rwho -a ! -L /var/rwho ] ; then
 	find . ! -name . -mtime +7 -execdir rm -f -- {} \; ; }
 fi
 
-#find / \( ! -fstype local -o -fstype rdonly \
-#		-o -fstype procfs \) -a -prune -o \
-#	-name 'lost+found' -a -prune -o \
-#	-name '*.core' -a -print -o \
-#	\( -name '[#,]*' -o -name '.#*' -o -name a.out \
-#	   -o -name '*.CKP' -o -name '.emacs_[0-9]*' \) \
-#		-a -atime +3 -a -execdir rm -f -- {} \; -a -print > $TMP
-
-if egrep -q '\.core$' $TMP; then
-	echo ""
-	echo "Possible core dumps:"
-	egrep '\.core$' $TMP
-fi
-
-if egrep -qv '\.core$' $TMP; then
-	echo ""
-	echo "Deleted files:"
-	egrep -v '\.core$' $TMP
-fi
-
 if [ -d /var/msgs -a ! -L /var/msgs ]; then
 	msgs -c
 fi