Why is gets throwing an error when arguments are passed to my ruby script?

Question

I\'m using gets to pause my script\'s output until the user hits the enter key. If I don\'t pass any arguments to my script then it works fine. However, if I

Answer 1

Ruby will automatically treat unparsed arguments as filenames, then open and read the files making the input available to ARGF ($<). By default, gets reads from ARGF. To bypass that:

$stdin.gets

It has been suggested that you could use STDIN instead of $stdin, but it's usually better to use $stdin.

Additionally, after you capture the input you want from ARGV, you can use:

ARGV.clear

Then you'll be free to gets without it reading from files you may not have intended to read.

Answer 2

The whole point of Kernel#gets is to treat the arguments passed to the program as filenames and read those files. The very first sentence in the documentation reads:

Returns (and assigns to $_) the next line from the list of files in ARGV (or $*)

That's just how gets works. If you want to read from a specific IO object (say, $stdin), just call gets on that object.