#!/bin/rc
rfork en
if(! ~ $#* 2 || ! test -r $1 || ! test -r $2){
	echo usage: $0 file1 file2 >[1=2]
	exit usage
}
< $1 <[3] $2 >[2]/dev/null while(){
one = `'
'{read}
two = `'
'{read <[0=3]}
	if(~ $one '' && ~ $two '')
		exit
	echo $one '	||	' $two
}