#!/bin/rc
# which file will this command envoke

rfork e

if (~ $#* 0){
	echo 'usage: which file...'
	exit 'usage'
}

for(dir in $path){
	if(~ $dir /bin){
		{ for (nsdir in `{ns | awk '$NF == "/bin" {print dir, $(NF -1)}'}){
			if (test -f $nsdir/$1)
				echo $nsdir/$1
		} } | tail -r
	}
	if(! ~ $dir /bin){
		if (test -f $dir/$1)
			echo $dir/$1
	}
}