How to work with fields of a csv file?

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# 8  
Old 01-29-2008
() helps you group patterns. \(^.\) is represented by \1. Similarly \(.*\) is represented by \2

You cannot use [] instead of ()
# 9  
Old 01-29-2008
the command I found through googling.But I am not able to understand, how this command selects second field, and do "p" in the command represents paste?
# 10  
Old 01-29-2008
p -> print
# 11  
Old 01-29-2008
\(^.\)*,\(.*\)/\1"whatever you want to insert here"\2

In this , how did it elects second field?
I came to knw what do '1' and '2' do in this command?
# 12  
Old 01-29-2008
sed -n 's/\(^.\)*,\(.*\)/\1\2"whatever you want to insert here"\3/p' filename.csv
this will elect the column between 2nd and 3rd.

sed -n 's/\(^.\)*,\(.*\)/\1\2\3"whatever you want to insert here"\4/p' filename.csv
this will elect the column between 3rd and 4th
# 13  
Old 09-16-2008

can u explain the sed u have used??
wat if i want to change the 3rd field?? wat do i have to change in the syntax for that?

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