From: Joe Williams <joe@...>
Date: 2009-04-25T08:47:00+09:00
Subject: Re: ARGV, STDIN and gets

ARGV.shift works perfectly, should have thought of that.

Thanks!

-Joe


Joel VanderWerf wrote:
> Joe Williams wrote:
>> I am running into an issue where I have a script that takes two 
>> command line arguments and reads from stdin. It seems that gets is 
>> not getting to stdin because it is hitting ARGV first 
>> (http://www.ruby-doc.org/core/classes/Kernel.html#M005996). Is there 
>> a way around this so that I can pass in arguments and listen on stdin 
>> as well. Running the script without args works perfectly. What I am 
>> doing currently looks something like the following:
>>
>> var1 = ARGV[0]
>> var2 = ARGV[1]
>> var3 = gets
>>
>> Any advice would be helpful.
>>
>> Thanks.
>> -Joe
>
> Kernel#gets reads from ARGF, which, if there's anything in ARGV, is 
> read from those files. So you can clear from ARGV first, if you want 
> the option of passing your file as the 3rd arg instead of stdin.
>
> $ cat tt.rb
> var1 = ARGV.shift
> var2 = ARGV.shift
> var3 = gets
> p [var1, var2, var3]
>
> $ cat data
> this is some text
> $ ruby tt.rb foo bar data
> ["foo", "bar", "this is some text\n"]
> $ ruby tt.rb foo bar
> type some input
> ["foo", "bar", "type some input\n"]
>

-- 
Name: Joseph A. Williams
Email: joe@joetify.com
Blog: http://www.joeandmotorboat.com/