Command Line Processing / Pipes

ruby-talk
1

Hi,

Yes, when I explicitly call ruby rather than rely on the file
association it works as I would expect. I don't understand why the
exception is thrown when ruby isn't explicitly invoked - as x1 mentioned
it got to Ruby. The file association step seems to mess everything up.
Windows never was very good with its command line - ho hum.

This now does what I'd like so I'm very happy. Chris, Robert, A LeDonne,
x1 and Pit Captain - Thanks!

···

-----Original Message-----
From: A LeDonne [mailto:aledonne.listmail@gmail.com]
Sent: 18 May 2006 19:23
To: ruby-talk ML
Subject: Re: Command Line Processing / Pipes

On 5/18/06, Stuart Holden <Stuart.Holden@baring-asset.com> wrote:

Hi Chris,

Sorry, I forgot about 'cat' being a non-standard cmd. It's on this
machine as part of Cygwin. The one liner you gave me works great. It

can

accept filenames as arguments and STDIN via a pipe. Howerver, what I

am

going to be doing is too complex for a one line script so I will need

to

put it in a .rb file. I thought the equivalent of the '-n -e "print"'
one liner would be:

        while gets()
                print
        end

but, when I put this in a file called parser.rb and try

        type input.txt | parser.rb

I get the following:

        The process tried to write to a nonexistent pipe.
        c:/scripts/parser.rb:1:in `gets': Bad file descriptor
(Errno::EBADF)
          from c:/scripts/parser.rb:1

Thanks,
Stu

What happens if you do:

type input.txt | ruby parser.rb

?

I think the point may be that you have to call the ruby interpreter
explicitly, rather than relying on windows file associations to do the
right thing when there's a pipe involved.

-A

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