[ILUG] Stopped (tty input) driving me bananas

[Kevin Dobey]

I have found that sometimes if a program a background program tries to write
to stderr it can cause it to stop - this may be a problem with writting to
stdout also. 

Before you say it, I know  nohup should create a file for any stdout
nohup.output or something - but it's worth a check !

You could try doing "nohup cmd > stdout.log 2>stderr.log &" or what ever is
approproiate for your shell. 

Have you checked for that nohup file ?

-----Original Message-----
From: Niall O Broin [mailto:nobroin at sced.esoc.esa.de]
Sent: 03 June 1999 19:58
To: ilug at linux.ie
Subject: [ILUG] Stopped (tty input) driving me bananas


Ideas please - I'm at my wit's end here. I have two scripts running on
two Linux boxen. Box A runs a Perl script which processes some files and
packages them up and copies them to box B. Box B runs a shell script which
copies them to a third Linux box, where they are further processed, but
that's not germane. My problem is that that both the Perl and shell script
are designed to be run as daemons, so they have no user interaction (they
do write log files). During debugging they're not yet started at bootup
so I run them with    nohup script & (nohup in case I shut down the session)

This works and I carry on working in the relevant shells. BUT every now and
then
I get the message     

[1]+  Stopped (tty input)     nohup script_name

before my shell prompt. To get back on track, I simply do an   fg  , hit
enter a
couple of times, press ^Z and then type  bg  again.

Bu I can't for the life of me see what's happening here - my script doesn't
read
from stdin, and I can't see that any of the programs it uses would do so
either.
All suggestions gratefully listeened too :-)



Kindest regards,


Niall  O Broin		

UNIX Network Administrator 		 	nobroin at esoc.esa.de
Ground Systems Engineering Department		Ph./Fax  +49 6151 90
3619/2179
European Space Operations Centre, Darmstadt, Germany


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