Add numbers to the beginning of every line in a file

Question

How can I add numbers to the beginning of every line in a file?

E.g.:

This is
the text
from the file.

Becomes:

000000001 This is
000         


        

Answer 1

Here's a bash script that will do this also:

#!/bin/bash
counter=0
filename=$1
while read -r line
do
  printf "%010d %s" $counter $line
  let counter=$counter+1
done < "$filename"