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# randomize time of sa rules updating RNDM1=$[$RANDOM/555] # 0-59 RNDM2=$[$RANDOM/1424] # 0-23 sed "s/^[0-9]\+ \+[0-9]\+/$RNDM1 $RNDM2/" -i /etc/cron.d/sa-update >/dev/null 2>&1 ||: