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Full Discussion: Handling Stdout&StdErr for background jobs.
Operating Systems Solaris Handling Stdout&StdErr for background jobs. Post 302200928 by alvinbush on Friday 30th of May 2008 10:32:10 AM
Old 05-30-2008
Handling Stdout&StdErr for background jobs.
Hello Friends,

sorry, i am not very familiar with Unix programming. Could you please help me on this?

We have to start different components from a startup script.

each components are started as below in the background in a startprocess function

$nohup $file $args >>$logFile 2>&1 &

after this the script calls some waiting method and waits in the logfile for some particular string as below

if grep -c "$pattern" $logFile>1; then ....

and go ahead with the next component.


We have now the problem that the background jobs continue writing into the log file even after startup and covering the disk space.
I am looking for a way to redirect the stdout of the background jobs to dev/null immediately after finding the successful start entry in the log.



Thanks in advance,

Alvin
 

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LEARN ABOUT OPENSOLARIS

starting

starting(7)                                              Miscellaneous Information Manual                                              starting(7)

NAME

       starting - event signalling that a job is starting

SYNOPSIS

       starting JOB=JOB INSTANCE=INSTANCE [ENV]...

DESCRIPTION

       The  starting  event is generated by the Upstart init(8) daemon when a new instance of a job begins starting.  The JOB environment variable
       contains the job name, and the INSTANCE environment variable contains the instance name which will be empty for single-instance jobs.

       init(8) will wait for all services started by this event to be running, all tasks started by this event  to  have  finished  and  all  jobs
       stopped by this event to be stopped before allowing the job to continue starting.

       This allows jobs to effectively insert themselves as dependencies of other jobs.  The event is typically combined with the stopped(7) event
       by services.

       Job configuration files may use the export stanza to export environment variables from their own environment into the starting event.   See
       init(5) for more details.

EXAMPLE

       A service that wishes to be running whenever another service would be running, started before and stopped after it, might use:

              start on starting apache
              stop on stopped apache

       A task that must be run before another task or service is started might use:

              start on starting postgresql

SEE ALSO

       started(7) stopping(7) stopped(7) init(5)

Upstart                                                             2009-07-09                                                         starting(7)
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