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Got an error in above code .There is no variable named var defined in your code.Re-check that.Below works as expected


#!/bin/bash
#var=1024
mem=`(cat /proc/meminfo | grep MemTotal)`...

As far as i understand your query, you may use cron tab to run run the script on specified day.I dont understand the worth of calender here. So please give a detail query to assist you more.
Thanks