How to add 100 spaces at end of each line of a file in Unix

Question

I have a file which is supposed to contain 200 characters in each line. I received a source file with only 100 characters in each line. I need to add 100 extra white spaces

Answer 1

You can use printf in awk:

awk '{printf "%s%*.s\n", $0, 100, " "}' filename > newfile

This printf will append 100 spaces at the end of each newline.