I need to insert data into a perticular field of a csv file, lets say second field.

Can any one help me to do this?
I found that we can do it with sed. can any one guide me to accomplish this?
thanks in advance.

awk 'BEGIN {FS=","}
{
print $1","x","$2
}' x=$var filename.csv

cant I have any command line operation?

can we do this with 'sed'?

sed -n 's/\(^.\)*,\(.*\)/\1"whatever you want to insert here"\2/p'

sed -n 's/\(^.\)*,\(.*\)/\1"whatever you want to insert here"\2/p' filename.csv

thanks for reply,

what do '(' ')' these represent? can we use [] braket instead of () ?

() helps you group patterns. \(^.\) is represented by \1. Similarly \(.*\) is represented by \2

You cannot use [] instead of ()