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mlu: checks and allow relative path

--- a/bin/mlu

+++ b/bin/mlu

@@ -1,8 +1,15 @@

-#!/bin/rc

+#!/bin/rc -e

+rfork n

 if(! ~ $#* 2){

 	echo usage: $0 listname destdir

 	exit usage

 }

+d=`{pwd}

 9fs lists.9front.org

 cd /n/lists.9front.org/lists/$1

-syncab /n/lists.9front.org/lists/$1 $2 | tee | rc

+d=`{cleanname -d $d $2}

+if(! test -d $d){

+	echo destination $d doesn''t exist

+	exit usage

+}

+syncab /n/lists.9front.org/lists/$1 $d | tee | rc