refactored alias.c heavily especially substituted the loop-based alias_expand() with a recursive approach. Now alias_expand() wraps alias_one() which recursively expands aliases. In principle the ``data processing'' is the same but now it's clearer structured and thus easier to understand IMO. The loop might have been faster but I don't care for speed -- the most simple solution is the best. It's fast enough, that is sufficient.

#!/bin/sh
#
# update the date and version of man pages

if [ $# -lt 2 ] ; then
	echo "usage: update-manpage-header VERSION FILES..." >&2
	exit 1
fi


date=`date +%Y-%m-%d`

version="$1"
shift

for i do
	ed -s "$i" <<!
/^\.TH/s#[0-9]\{4\}-[0-9]\{2\}-[0-9]\{2\}#$date#
s#[0-9]\{1,\}\.[0-9]\{1,\}\.[0-9]\{1,\}#$version#
p
w
q
!
done