Handling Stdout&StdErr for background jobs.


 
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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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Handling Stdout&StdErr for background jobs.
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disown(1)							   User Commands							 disown(1)

NAME
disown - ksh93 built-in function to disassociate a job with the current shell SYNOPSIS
disown [job ...] DESCRIPTION
The ksh93 disown command prevents the current shell from sending a HUP signal to each of the specified jobs when the current shell termi- nates a login session. If job is omitted, disown sends the HUP signal to the most recently started or stopped background job. OPERANDS
The following operands are supported: job Specifies the job or jobs on which disown operates. Specify job as one of the following: number Refers to a process ID. -number Refers to a process group ID. %number Refers to a job number. %string Refers to a job whose name begins with string. %?string Refers to a job whose name contains string. %+ or %% Refers to the current job. %- Refers to the previous job. EXIT STATUS
0 Successful completion. >0 One or more specified jobs does not exist. EXAMPLES
Example 1 Disowning a Job The following example disowns job 1: example% disown %1 AUTHORS
David Korn, dgk@research.att.com ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |Interface Stability |Uncommitted | +-----------------------------+-----------------------------+ SEE ALSO
bg(1), jobs(1), ksh93(1), wait(1), attributes(5) SunOS 5.11 18 Apr 2007 disown(1)