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

Another way in GNU awk using string-manipulation function sprintf.

awk 'BEGIN{s=sprintf("%-100s", "");}{print $0 s}' input-file > file-with-spaces

A proof with an example:-

$ cat input-file
1234jjj hdhyvb 1234jjj
6789mmm mddyss skjhude
khora77 koemm  sado666
nn1004  nn1004 457fffy
$ wc -c input-file
      92 input-file
$ awk 'BEGIN{s=sprintf("%-100s", "");}{print $0 s}' input-file > file-with-spaces
$ wc -c file-with-spaces
      492 file-with-spaces