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A dumb question but... Bill H 06-09-2008
Posted by Bill H on June 9, 2008, 3:26 pm
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 I have this perl script that I have been using for bout 10 years that
sends out a mass email to one of my clients member list (about 4,000)
people. I run it at a shell prompt on an Apache server and it will
display back a "sent email address" for each one it processes. Takes
about 2 hours to run through. I am not concerned about speeding it up
or anything since I only do it once a week and usually off eating
lunch while it runs, but I have always wondered. Would perl be
notified and / or care if I closed that shell window or would it just
continue on till it was done?

Bill H

Posted by nolo contendere on June 9, 2008, 3:41 pm
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> I have this perl script that I have been using for bout 10 years that
> sends out a mass email to one of my clients member list (about 4,000)
> people. I run it at a shell prompt on an Apache server and it will
> display back a "sent email address" for each one it processes. Takes
> about 2 hours to run through. I am not concerned about speeding it up
> or anything since I only do it once a week and usually off eating
> lunch while it runs, but I have always wondered. Would perl be
> notified and / or care if I closed that shell window or would it just
> continue on till it was done?


That depends on your shell, and how it handles hangup signals. Use
nohup explicitly if you want to be sure that your script will continue
to run even after you close your window.

Posted by Joost Diepenmaat on June 9, 2008, 3:43 pm
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> I have this perl script that I have been using for bout 10 years that
> sends out a mass email to one of my clients member list (about 4,000)
> people. I run it at a shell prompt on an Apache server and it will
> display back a "sent email address" for each one it processes. Takes
> about 2 hours to run through. I am not concerned about speeding it up
> or anything since I only do it once a week and usually off eating
> lunch while it runs, but I have always wondered. Would perl be
> notified and / or care if I closed that shell window or would it just
> continue on till it was done?

By default programs exit on a SIGHUP, so unless the script you're
using takes care to handle that, it will probably exit.

If you want to, you could run the program in screen instead (I
actually prefer this for long-running processes, since it can be
slightly too easy to kill an xterm / ssh session).

See: http://en.wikipedia.org/wiki/SIGHUP
http://en.wikipedia.org/wiki/GNU_Screen


--
Joost Diepenmaat | blog: http://joost.zeekat.nl/ | work: http://zeekat.nl/

Posted by Martijn Lievaart on June 9, 2008, 5:01 pm
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On Mon, 09 Jun 2008 21:43:35 +0200, Joost Diepenmaat wrote:

> If you want to, you could run the program in screen instead (I actually
> prefer this for long-running processes, since it can be slightly too
> easy to kill an xterm / ssh session).

I second that, screen is a /very/ good solution.

M4

Posted by Martijn Lievaart on June 9, 2008, 3:59 pm
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On Mon, 09 Jun 2008 12:26:26 -0700, Bill H wrote:

> I have this perl script that I have been using for bout 10 years that
> sends out a mass email to one of my clients member list (about 4,000)
> people. I run it at a shell prompt on an Apache server and it will
> display back a "sent email address" for each one it processes. Takes
> about 2 hours to run through. I am not concerned about speeding it up or
> anything since I only do it once a week and usually off eating lunch
> while it runs, but I have always wondered. Would perl be notified and /
> or care if I closed that shell window or would it just continue on till
> it was done?

On most (all) shells, that would send a SIGHUP to the process. If you
don't catch that signal, it kills the process.

If you don't want that, either use nohup or batch.

M4

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