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Could anybody help me to optimize the script below:

#!/bin/ksh
DATE1=`date '+%d%m%y'`
DATE2=`date '+%e/%m/%Y'`
DATE3=`date '+%H:%M:%S'`
DATE4=`date '+%Y%m%d'`
DATE5=`date '+%d'`
...

But I need the sed as the whole script is doing calculation base on hour, minutes, second and ms.

Can anybody please help me on how to optimize following command as it use up a lot of CPU :

tail -f $DIR3$DATE4.log |\
while read line
do echo $line | egrep "Processing...