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isNumeric()
{
numericExpression='^[0-9]+$'
if ! [[ $1 =~ $numericExpression ]]
then
echo 1;
else
echo 0;
fi
}
...

Sorry i dint get wat you are try to telling

The above suggestion worked perfectly all right..

I have an other requirement.
With the above script I will have 2 csv files $SEGMENT_FILE and $NON_SEGMENT_FILE.
Now with the $SEGMENT_FILE which...

no..I need solution a bit urgently

#Check if the argument is numeric
isNumeric()
{
numericExpression='^[0-9]+$'
if ! [[ $1 =~ $numericExpression ]]
then
echo 1;
else
...