crontab will help us to run/execute the script every minute ,however if we want run/execute the script for every second then below mentioned code is very useful.
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while(true);
do
/usr/bin/perl / appl/netcool/omnibus/utils/SAM_V5.1.pl > /tmp/SAM_V5.1log
sleep 30;
done
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Note: successfully tested and its working.