Shell Programming and Scripting

Correct, since variable x is uninitialized and it is used in a string context.

Thanks all for your responses, I have a question;

rdcwayx your code simplly covers all mine , it is good that you put "!b[$1]++ " option to remove duplicates there. When one of first field of next lines is same then it skips directly to the next line without applying the rest of code does not it?

Besides Scrutinizer it is good to learn how "x" works there

And Scrutinezer i added the

Code:

!b[$1]++

part to your code and it also covers removing duplidates now

Code:

nawk -F, '!b[$1]++{printf (NR>1?FS:x)91$1+0} END{print x}' FILE

Regards

Hi Eagle, It did not know that was a requirement. But then I would add this (to exclude duplicates that differ only in an "f"):

Code:

awk -F, '!b[$1+0]++{printf (NR>1?FS:x)91$1+0} END{print x}'  infile