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Full Discussion: Problem running a program/script in the background from a script
Top Forums Shell Programming and Scripting Problem running a program/script in the background from a script Post 302508356 by Chubler_XL on Monday 28th of March 2011 02:02:22 AM
Old 03-28-2011
Quote:
Originally Posted by methyl
If the script needs to wait for a single job to complete there is no reason to background the job. In this context a background job issued without a "nohup" might as well be in foreground.
Rather than "ps" try the "jobs" command to monitor your background processes.
"jobs" will only list the child processes of the current script not those started by xxx.ksh, unless it is source in the current shell by . xxx/xxx.ksh

I'm reluctant to recommend sourcing the script or changing it (e.g. adding a "run in foreground" flag, or a "wait before returning" flag) without knowing more about what it is doing and how complex the bacground task(s) it starts are. This is why I recommended using ps to watch the tasks it starts and continuing when the are done.
 

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LEARN ABOUT CENTOS

rhnsd

RHNSD(8)							   Red Hat, Inc.							  RHNSD(8)

NAME

       rhnsd - A program for querying the Spacewalk server for updates and information.

SYNOPSIS

       rhn_check [options]

DESCRIPTION

       rhnsd  is a background daemon process that periodically polls the Spacewalk server to see if there are any queued actions available. If any
       are queued, rhnsd will execute those actions.

       rhnsd is typically started from the initialization (init) scripts in /etc/init.d/rhnsd.	when it's time to poll the  Spacewalk  server  for
       available updates and actions. The default interval is every 240 minutes.  The minimum polling interval is 60 minutes.

       To  check for updates, rhnsd runs an external program called rhn_check. This is a small application that actually makes the network connec-
       tion to Spacewalk.

       The rhnsd daemon does not listen on any network ports, nor does it ever talk to the network directly. Any network activity is done via  the
       rhn_check utility.

       rhnsd  can  be  configured  by editing the /etc/sysconfig/rhn/rhnsd.  configuration file. This is actually the configuration file the rhnsd
       initialization script /etc/init.d/rhnsd.  uses.

OPTIONS

       -i, --interval
	      Specify the interval that rhnsd should wait between checking the Spacewalk. Default is 240 minutes, the minimum is 60 minutes.  This
	      can also be specified in /etc/sysconfig/rhn/rhnsd

       -f, --foreground
	      force the rhnsd process to run in the foreground instead of automatically backgrounding itself, as it does by default.

FILES

       /etc/sysconfig/rhn/rhnsd
	      Configuration settings for the rhnsd daemon's initialization script.

SEE ALSO

       rhn_check(8), rhn_register(8), rhnsd(8), rhn-profile-sync(8), rhnplugin(8), up2date(5).

AUTHORS

       Preston Brown <pbrown@redhat.com>
       Cristian Gafton <gafton@redhat.com>
       Adrian Likins <alikins@redhat.com>
       James Bowes <jbowes@redhat.com>

BUGS

       Report bugs to <http://bugzilla.redhat.com>.

COPYRIGHT

       Copyright (C) 1999-2006 Red Hat, Inc.

       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

Linux								 2006 November 13							  RHNSD(8)
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