Shell Programming and Scripting

#!/bin/ksh
date_var=`date "+%Y%m%d%H%M%S"`
memory_file_name=Mem-"$date_var".csv

total_memory_mb=`prtconf -v | grep Memory |tr -s " " "," | cut -f3 -d ','`
total_memory_kb=`expr $total_memory_mb \* 1024`
echo total memory is $total_memory_kb >> script-"$date_var".log
free_memory=`vmstat 1 1 |grep -v memory |grep -v swap|tr -s " " "," |cut -f6 -d ','`
used_memory=`expr $total_memory_kb - $free_memory`
echo calaculated memory informations >>script-"$date_var".log
#write memory details to file
echo Used,Free,Total,Date >> $memory_file_name

echo $used_memory,$free_memory,$total_memory_kb,$date_var >> $memory_file_name
echo Finished writing to file >>script-"$date_var".log

15 * * * * /domain/appplication/memory/script.sh >> /domain/appplication/memory/log/cron.log