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x/path: accept pathname as last argument

--- a/path

+++ b/path

@@ -1,11 +1,14 @@

 #!/bin/rc

 # x/path -- extract datums from the path

 rfork e

-wd=`{pwd}

+if(! ~ $$#* -*)

+	wd=$$#*

+if not

+	wd=`{pwd}

 if(! ~ $wd /x/*)

 	exit notinx

-while(! ~ $#1 0 && ~ $1 -*){

-	switch($1){

+for(arg){

+	switch($arg){

 	case -P

 		echo $wd | sed 's,/x/[^/]+(.*),\1,'

 	case -p