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Full Discussion: usage of ps -ef
Top Forums UNIX for Advanced & Expert Users usage of ps -ef Post 302212611 by risshanth on Tuesday 8th of July 2008 02:41:57 AM
Old 07-08-2008
usage of ps -ef

Hi,
I can have only one instance of my script running at any point of time. So I have :
SCRIPT_NAME=$0
if [ `ps -ef | grep " ${SCRIPT_NAME}" | grep -v "grep" | wc -l` -gt 1 ]; then
echo "The process $0 is already running. Aborting the current instance of the job $0"
exit 1

fi


And in the last line of the script i had given exit 0

At times, though the script is not running, i get an error "The process is already running ..." and my script get aborted. So wat can be done for this ?

My requirement is I will scheudle this scirpt in autosys and will be executed every half an hour. And only one instance of the script should be executed at any point of time.

Can any one please help me ??

thanks in advance.
 

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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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