Hi,
I need few clarifications in the requirements.
In the file, are we supposed to check only the lines that contains

"INFO Bonus required "

to the next line that contains

"INFO AIR credit operation success "???

If yes, we can go for a simpe script like


-----------------------------------------------------------------------

if [ $# -lt 1 ]
then
echo "Usage : " $0 "<file_name>"
exit 1
fi

echo "Going to scan the file : "$1

file_name=`echo $1`

prev_line=2

for cur_line in `cat $file_name | tr ' ' '+'`
do

echo $prev_line | grep "INFO+Bonus+required+" >test_file

if [[ -s test_file ]]
then
prev_msisdn=`echo $prev_line | tr ',' '+' | tr -s '+' | cut -d '+' -f 11`
cur_msisdn=`echo $cur_line | tr ']' '+' | tr -s '+' | cut -d '+' -f 13`

if [ "$prev_msisdn" -ne "$cur_msisdn" ]
then
echo "msisdn mismatch found"
echo "cur_msisdni : "$cur_msisdn
echo "prev_msisdn : "$prev_msisdn
fi
fi


prev_line=`echo $cur_line`

done
-----------------------------------------------------------------------




which works like

$> ./check_msisdn a
Going to scan the file : a
msisdn mismatch found
cur_msisdni : 113220
prev_msisdn : 13220


and the contents of file a were the same that you have provided except for a change in the line
------------------------------------------------------------
2008:07:08 07:03:20.656 (tid 4) INFO Bonus required [ msisdn = 13220, bonus = 18960, total usage = 189606 ]
2008:07:08 07:03:20.687 (tid 4) INFO AIR credit operation success [ msisdn = 113220]
---------------------------------------------------------------