add u and u.rc
diff --git a/bin/u.rc b/bin/u.rc
new file mode 100755
index 0000000..e0827a0
--- /dev/null
+++ b/bin/u.rc
@@ -0,0 +1,11 @@
+#!/usr/local/plan9/bin/rc
+
+if(~ $#PLAN9 1) opath=$path i=() {
+	path=()
+	for(i in $opath){
+		if(! ~ $i $PLAN9/bin)
+			path=($path $i)
+	}
+	path=($path $PLAN9/bin)
+}
+! ~ $#* 0 && exec $*