From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <86ef50171686ab117cd7bf95c4131fbf@quanstro.net>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] newbie rc question
From: erik quanstrom <quanstro@quanstro.net>
Date: Mon, 15 Oct 2007 13:22:03 -0400
In-Reply-To: <132f7ab76fee59596efcab59956f6c36@csplan9.rit.edu>
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> page says 'converting from troff to postscript' but then never
> actually displays anything. I'm sure there's something basic
> I'm forgetting here--can somebody help me figure out what's
> wrong?

the file descriptor is never closed, thus page never stops to render
what it's got.

what you want is the same thing with the cmd rolled inside.  something
like

#!/bin/rc

if(! ~ $#* 2){
	echo usage: w file cmd >[1=2];
	exit usage
}

s=''
while(){
	n=`{sum $1| sed 's/ .*//g'}
	if(! ~ $s $n){
		s=$n
		$2 < $1
	}
	sleep 1
}