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Top Forums Shell Programming and Scripting Run script in parallel in while loop Post 302918165 by RavinderSingh13 on Monday 22nd of September 2014 07:56:16 AM
Old 09-22-2014
Hello,

You can run the scripts in background, like following is an example for sleep process run in background.

Lets say a file in which number of mins/seconds have been given.(Input file).
Code:
cat file23
60
50
80
20
10
100

Now lets say we have a shell script same like your perl script. which needs to be executed in while loop.

Code:
cat test2.ksh
Q=$1
echo "starting sleep for" $Q "mins."
sleep $Q

Here is the example of While loop for same.

Code:
while read line
do
echo "Executing for" $line
./test2.ksh $line &
done < "file23"
Executing for 60
[1] 20921
Executing for 50
[2] 20922
Executing for 80
[3] 20923
Executing for 20
starting sleep for 60 mins.
[4] 20924
Executing for 10
starting sleep for 50 mins.
[5] 20931
starting sleep for 80 mins.
Executing for 100
[6] 20934

Hope following example may help you, similarly you can too put all proccesses in background while calling your perl script use at last
perl process_report.pl $repID &.

Thanks,
R. Singh

Last edited by RavinderSingh13; 09-22-2014 at 09:06 AM..
 

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IGNORE_USER_ABORT(3)							 1						      IGNORE_USER_ABORT(3)

ignore_user_abort - Set whether a client disconnect should abort script execution

SYNOPSIS
int ignore_user_abort ([string $value]) DESCRIPTION
Sets whether a client disconnect should cause a script to be aborted. When running PHP as a command line script, and the script's tty goes away without the script being terminated then the script will die the next time it tries to write anything, unless $value is set to TRUE PARAMETERS
o $value - If set, this function will set the ignore_user_abort ini setting to the given $value. If not, this function will only return the previous setting without changing it. RETURN VALUES
Returns the previous setting, as an integer. EXAMPLES
Example #1 A ignore_user_abort(3) example <?php // Ignore user aborts and allow the script // to run forever ignore_user_abort(true); set_time_limit(0); echo 'Testing connection handling in PHP'; // Run a pointless loop that sometime // hopefully will make us click away from // page or click the "Stop" button. while(1) { // Did the connection fail? if(connection_status() != CONNECTION_NORMAL) { break; } // Sleep for 10 seconds sleep(10); } // If this is reached, then the 'break' // was triggered from inside the while loop // So here we can log, or perform any other tasks // we need without actually being dependent on the // browser. ?> NOTES
PHP will not detect that the user has aborted the connection until an attempt is made to send information to the client. Simply using an echo statement does not guarantee that information is sent, see flush(3). SEE ALSO
connection_aborted(3), connection_status(3), Connection Handling for a complete description of connection handling in PHP. . PHP Documentation Group IGNORE_USER_ABORT(3)
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