Shell script for reporting nohup.out general errors into specified email/s.

Error_Reporter_nohup.sh

#!/bin/bash

#Check whether a temporary file exisits
if [ ! -e nohup_errors_log ];
#If not you are here
 then
        #Grep for the desired pattern within your log file to catch the Error and Save the content to a new temporary file
        grep "\[[0-9]\{4\}-[0-9]\{2\}-[0-9]\{2\} [0-9]\{2\}:[0-9]\{2\}:[0-9]\{2\},[0-9]\{3\}\] ERROR" /home/ubuntu/ravindu/nohup.out | sort > nohup_errors_log
        #Mail the recorded error list to the desired mail (You can mail it to multiple uses also)
        mail -s "Error Log for nohup.out" [email protected]  < nohup_errors_log
 else
        #Compare the difference between the nohup.out file and the content within the temporry file and only mail send me a mail only when ther s an error
        comm -23 <(grep "\[[0-9]\{4\}-[0-9]\{2\}-[0-9]\{2\} [0-9]\{2\}:[0-9]\{2\}:[0-9]\{2\},[0-9]\{3\}\] ERROR" /home/ubuntu/ravindu/nohup.out | sort) nohup_errors_log | mail --exec 'set nonullbody' -s "Error Log for nohup.out" [email protected]
        #Add the new content into our temporary file
        grep "\[[0-9]\{4\}-[0-9]\{2\}-[0-9]\{2\} [0-9]\{2\}:[0-9]\{2\}:[0-9]\{2\},[0-9]\{3\}\] ERROR" /home/ubuntu/ravindu/nohup.out | sort > nohup_errors_log
fi