nawk won't accept comma as delimiter

Shell Programming and Scripting
1

I have a text file delimited by commas, with three fields (no " marks).

I want to use awk to create a fourth field which is equal to the line number + field 1 + .txt

I've searched this forum and found the following

nawk -v OFS=';' '{print $0, FNR}' myFile

Which I've amended to change the ; to a , - and it works simply to append the line number at the end.

But when I amend it to the following, it won't accept that the commas is a delimeter and still thinks it should be a space;

nawk -v OFS=',' '{print $0, FNR "_" $1 ".txt"}' myFile

Field 2 has spaces, and it thinking that �1 is the whole of field 1 and the comma up to the first space in field 2.

Help! How can I get this awk to recognise that the comma is the delimter?

---------- Post updated at 01:03 PM ---------- Previous update was at 12:58 PM ----------

I've sorted this by amending OFS to FS - not sure what the difference is but it seemed to work

2

try this

nawk -v OFS="\," '{print $0, FNR "_" $1 ".txt"}' myfile
3

FS=input field selector
OFS=output field selector