From: James Edward Gray II <james@...>
Date: 2006-01-05T00:26:45+09:00
Subject: Re: gets bug?

On Jan 4, 2006, at 9:17 AM, Shea Martin wrote:

>
> <snip>
> if ARGV.size > 0
>    puts "first arg is #{ARGV[0]}"
> end
> puts "enter text"
> ans = gets
> puts "you said #{ans}"
> </snip>
>
> Run this code, as ./test.rb.  Then run it with an command line arg,  
> like "./test.rb -x".  And you will get an error like this:
>
>   "test.rb:3:in `gets': No such file or directory - -x  
> (Errno::ENOENT)"
>
> The fix I have found, is to change gets to $stdin.gets.  I saw some  
> traffic on the mailing list archives regarding this, but no  
> resolution.
>
> Is this expected behaviour?

Yes it is.  Kernel.gets() reads from files specified as command-line  
options or STDIN, if none were given.  This makes it easy to write  
Unix-style filters.

You can always shift the option out of ARGV before calling gets()  
with something like:

if ARGV.first == "-x"
   ARGV.shift
   # ...
end

Hope that helps.

James Edward Gray II