Note that you did not follow any of the advice I listed above. You did not show a sample of input. You did not show a sample of output. You did not explain why you are using a one-liner. You did not say why the provided code modification didn't do what you needed. Why are you making it hard for me to help you?

I have files like file 1,file 2,file 2 etc like in hundreds...

You can use opendir and readdir to cycle over, as I said previously, or use glob if you are so inclined. -n uses <> to read files (see I/O Operators), so it will implicitly cycle over the argument list - thus *.gcount will be expanded by the shell into a full file list and get cycled over.

It has data in columns so I would like to extract 0 and 4 column from every file

So why aren't you using Text::CSV to read it?

i am asking that if theres any posibility to include every thing in single code

A great deal is possible. That doesn't make it a good idea. After all this time and effort, a simple script would have been written and done already. That certainly could be considered a "single code". Why are you hung up on one-liners?