How to work with fields of a csv file?

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# 1  
Old 01-29-2008
Error How to work with fields of a csv file?

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.
# 2  
Old 01-29-2008
awk 'BEGIN {FS=","}
print $1","x","$2
}' x=$var filename.csv
# 3  
Old 01-29-2008

cant I have any command line operation?

can we do this with 'sed'?
# 4  
Old 01-29-2008
sed -n 's/\(^.\)*,\(.*\)/\1"whatever you want to insert here"\2/p'
# 5  
Old 01-29-2008
There are a number of different types of CSV files i.e. a,b,c , "a","b","c" , etc.

Here is an example of changing the second field of a CSV file without quotes
$cat file
$ sed 's/^\([^,]*\),[^,]*,/\1,999,/' file

Here is an example of changing the second field of a CVS file with double quotes
$ cat file
$ sed 's/^\("[^"]*"\),"[^"]*",/\1,"999",/' file

# 6  
Old 01-29-2008
sed -n 's/\(^.\)*,\(.*\)/\1"whatever you want to insert here"\2/p' filename.csv
# 7  
Old 01-29-2008
thanks for reply,

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