Using gets() gives “No such file or directory” error when I pass arguments to my script

Question

Hi I am making a simple ruby script practiced where I make a form using gets.chomp and arguments, the problem is that when gets.chomp use the scrip

Answer 1

It looks like you want to the user to type some input by reading a line from STDIN, the best way to do this is by calling STDIN.gets and not gets. So your line becomes:

word = STDIN.gets.chomp

This is documented as IO.gets. STDIN is an instance of IO.

Right now, you're executing Kernel.gets, which does something different (emphasis mine):

Returns (and assigns to $_) the next line from the list of files in ARGV (or $*), or from standard input if no files are present on the command line.

This appears to behave like STDIN.gets if ARGV is empty, but is not the same thing, hence the confusion.

Answer 2

If your program handle empty argument nor non-empty argument. You can use this module (especially if you already use default gets everywhere)

# A module that help to use method gets no matter what the file argument is
module InputHelper
    # Handle input method based on its file argument
    def gets
        if ARGV.nil?
            Kernel.gets
        else
            STDIN.gets
        end
    end
end

and then you could include it on your class

require 'input_helper'
class YourClass
    ...
    include InputHelper
    ...
end