#!/bin/rc
# saveold binary - keep all old versions of binary in bin;
# necessary for long-running programs.  manually remove _* at fs reboot.
# the for loop moves the version with the most leading underscores
# first, partly due to unicode's collating sequence.
switch ($#*) {
case 1
	rfork e
	targ=$1
	for (exe in _*_$targ _$targ $targ)
		if (test -e $exe)
			mv $exe _$exe
	exit ''
case *
	echo usage: $0 binary >[1=2]
	exit usage
}