Shell Programming and Scripting

#!/bin/ksh
# Variable Declaration
log=/opt/app/netcool/omnibus/log.txt
servertime=`date | awk '{print $2,$3,$4 }' | cut -d ":" -f1,2`
logtime=`ls -ltr $mttrapdlog | awk '{ print $6,$7,$8 }'`
time1=`date | awk '{print $4 }' | cut -d ":" -f2`
time2=`ls -ltr $mttrapdlog | awk '{ print $8 }' | cut -d ":" -f2`
######################## Main Script ########################
if [ $servertime -eq $logtime && `expr $time1 - $time2` -gt 5 ]  
then
mailx -s "Logfile log.txt is not updating for the past 5 minutes." mail.com
fi 
#############################################################

if [ \( $servertime -eq $logtime  \)  &&  \( `expr $time1 - $time2` -gt 5 \) ]

if [ $servertime -eq $logtime ] && [ `expr $time1 - $time2` -gt 5 ]