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From: frazier@oahu.cs.ucla.edu (Greg Frazier)
Newsgroups: comp.lang.perl
Subject: Re: Backgrounding a perl program
Message-ID: <frazier.677866741@oahu>
Date: 25 Jun 91 16:19:01 GMT
References: <1991Jun24.225506.29103@massey.ac.nz>
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G.Eustace@massey.ac.nz (Glen Eustace) writes:

>If I type the command

>	mu_quotasummary | more

>I get exactly what I wanted.

>	mu_quotasummary > results &

>sits in a Stopped state, awaiting tty input.
>I don't read from STDIN or /dev/tty at all.  Is there some trick to
>getting the program to run in the background.  I had wanted to put it
>in to crontab to run every week but my first attempts have meet with
>little success.

Do you have "rsh" commands in your program? I.e.

	system ("rsh thatmachine doquota");

If you do, it is the "rsh" that wants the tty input.  Change the
command to

	system ("rsh thatmachine -n doquota");

This redirects stdin to be from /dev/null on the remote
machine, rather than from your keyboard.  Yes, I realize
that "doquota", or whatever your command is, does not use
the keyboard, but "rsh" still tries to grab stdin before
calling "doquota".

If you don't have "rsh" in your code, then please ignore all
of that babble.
-- 


Greg Frazier	frazier@CS.UCLA.EDU	!{ucbvax,rutgers}!ucla-cs!frazier