Ah, yes... ARGV is not for input, it's for arguments. I can see
how it's sort of a subtle distinction. STDIN is where input from
pipes (|) and redirection (<) ends up. STDOUT (usually where
puts and so on write to by default I'm pretty sure) gets redirected
with ">".
ARGV is for command-line arguments.
Try your original script with something like:
% my_utility.rb some command line stuff
You'll get an array ["some", "command", "line", "stuff"]
-glenn
Greg Willits wrote:
> On Dec 18, 2009, at 10:15 PM, Glenn Little wrote:
>
>> If you meant what you typed and it wasn't a typo, the pipeline
>> is backwards. Should be:
>>
>> % head -n 1 file.txt | my_utility.rb
>
> OK. Still, I see no values in ARGV -- which seeing the line above, it
> would make sense. I'm no longer trying to pass an argument to
> my_utility, so I must have to pick up the piped input in some other way.
>
> So, back to Matt's input (no pun intended, ar-ar)...
>
> Instead of ARGV I use STDIN.gets, and it works.
>
> Thanks guys.
>
> -- gw
>
>
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