to write /etc/init.d/ntpd start

oikool has asked for the wisdom of the Perl Monks concerning the following question:

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Re: to write /etc/init.d/ntpd start by hippo (Archbishop) on Feb 20, 2014 at 11:20 UTC
To study the output (STDOUT or STDERR) from a system command use backticks or qx To study the return value of a system command use system	[reply]
Re: to write /etc/init.d/ntpd start by gri6507 (Deacon) on Feb 20, 2014 at 14:12 UTC
You may also want to look at IPC::Run, which is a module that allows you much more control over STDOUT, STDERR, return codes, and much more	[reply]
Re: to write /etc/init.d/ntpd start by karlgoethebier (Abbot) on Feb 20, 2014 at 19:48 UTC
gri6507 mentioned mod:IPC::Run already, but perhaps you might take look at IPC::System::Simple: Why isn't my exception caught? about what i figured out about the usage of this module just some days ago (it's in the update section). Imho very convenient stuff. Regards, Karl «The Crux of the Biscuit is the Apostrophe»	[reply]
Re: to write /etc/init.d/ntpd start by locked_user sundialsvc4 (Abbot) on Feb 20, 2014 at 15:22 UTC
Consider also using Nagios, which can handle software events ... or, simply configure this service to auto-restart. A “one-of-a-kind” Perl script ought not be required to get this done.
Re^2: to write /etc/init.d/ntpd start by karlgoethebier (Abbot) on Feb 20, 2014 at 20:24 UTC
"Consider also using Nagios..." No doubt, Nagios is good stuff, but i wonder how this hint is related to the OP. What oikool needs is `$? >> 8`, isn't it? Without `$? >> 8` he can't neither monitor that service nor restart it. "...simply configure this service to auto-restart. A “one-of-a-kind” Perl script ought not be required to get this done." Nope. Nagios can't be simply configured to restart a service. One needs to write an event handler. You need two scripts to accomplish this: one for the service check and one for the event handler. And setting up a robust solution for this is still a bit tricky. See State Types a.s.o. Best regards, Karl «The Crux of the Biscuit is the Apostrophe»	[reply] [d/l] [select]