This seems simple enough but I keep putting myself in an endless loop.

I have one text file with multiple lines. I need to append every line in that file (with the same characters). What I need to do is read the first line in file # 1, add ",blahblah" to the end of it and write the new line to a new file. Then on to the next line of file # 1, add the same thing and write it to the new file.

The end result would be a new file identical to the first but with ",blahblah" at the end of every line.

Any suggestions?