Re: pipes, scripts, and launchd

• Subject: Re: pipes, scripts, and launchd
• From: Perry Smith <email@hidden>
• Date: Fri, 28 Dec 2007 20:20:05 -0600
• Delivered-to: email@hidden
• Delivered-to: email@hidden

On Dec 28, 2007, at 3:21 PM, Michael Smith wrote:

On Dec 28, 2007, at 12:03 PM, email@hidden wrote:

I may be making too big a deal of all this but I can't figure out how
to do something like:

postgres <args> | rotatelogs <args>

from launchd.  If I put that command in a simple bash shell script, I
*believe* it will not work.  The signal will go to bash and bash will
not pass it along to the children.

There's something missing from what you're asking here; specifically, what signal are you talking about?

I could trap the signal and pass it along myself... but, $! gives the
pid for the last process in the pipe (rotatelogs). That is not what I
need to signal. I need the signal passed to postgres. And, in fact,
it would be nice if the signal did NOT pass to rotatelogs. I'd like
for it to stop when its input closes and not before then.

Are you actually trying to pass output from postgres to rotatelogs, or just have the two die cleanly together?

If the latter, then that's not a good way to do it.

Anyone have any suggestions of how to do this?

What is "this"?

Have the output from the daemon go to the input of another process.

Thanks,
pedz

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