Write a script named number lines. by. This script creates a program listing from a source program. This script should: Prompt the user for the names of two files. The input file name would be the name of the script itself, but be careful to use a different output filename! The script copies the lines of text from the input file to the output file, numbering each line as it goes. The line numbers should be right-justified in 4 columns, so that the format of a line in the output file looks like this example: