You know how to get input from a user with
ARGV. Now you will learn about reading from a file. You may have to play with this exercise the most to understand what’s going on, so do the exercise carefully and remember to do your checks. Working with files is an easy way to erase your work if you are not careful.
This exercise involves writing two files. One is the usual
ex15.rb file that you will run, but the other is named
ex15_sample.txt. This second file isn’t a script, but a plain text file we’ll be reading in our script. Here are the contents of that file:
This is stuff ...