Shell Programming and Scripting

#!/usr/bin/ksh
awk -F";" '{print $1}' serverlist|while read line
do
curr_ip=`nslookup $line|grep Address | sed -n '2p' | cut -d: -f2|sed 's/^[ \t]*//'`
old_ip=`awk -F";" /"$line"/'{print $2}' serverlist`
if [[ "$curr_ip" = "$old_ip" ]]
then
echo "equal"
fi
done

#!/usr/bin/ksh

for server in `cat serverlist`
do
  ser_name=`echo $server | cut -f1 -d";"`
  old_ip=`echo $server | cut -f2 -d";"`
  curr_ip=`/usr/bin/nslookup $ser_name | grep Address | sed -n '2p' | cut -d: -f2`
  if [ $curr_ip == $old_ip ]
    then
      echo "IP is SAME"
    else
      echo "IP is DIFFERENT"
    fi
done

#!/usr/bin/ksh
for server in `cat serverlist`
do
        ser_name=`echo $server | cut -f2 -d";"`
        old_ip=`echo $server | cut -f1 -d";"`
        curr_ip=`nslookup $ser_name | grep Address | sed -n '2p' | cut -d: -f2`
        if [ $curr_ip == $old_ip ]
        then
                echo "IP is SAME,$ser_name"
        else
                echo "IP is DIFFERENT,$ser_name" >> log.txt
                mailx -s "$ser_name" viku2006@gmail.com < log.txt
        fi
done

IFS=';'
while read ser_name old_ip
do
    curr_ip=$(dig $ser_name +short | sed -n '1p' )
    if [[ "$curr_ip" == "$old_ip" ]]
    then
       echo "IP is SAME, $ser_name"
    else
       echo "IP is DIFFERENT,$ser_name" >> log.txt
    fi
done < serverlist

grep -q DIFFERENT log.txt && mailx -s "IP DIFFERENT" < log.txt "