From: Just Another Victim of the Ambient Morality <ihatespam@...>
Date: 2006-07-15T14:41:46+09:00
Subject: Re: Some questions about Ruby and it's environment...


"Eric Hodel" <drbrain@segment7.net> wrote in message 
news:D50A04D4-B38E-433D-8C47-38AC2E67C079@segment7.net...
> On Jul 14, 2006, at 6:55 PM, Just Another Victim of the Ambient  Morality 
> wrote:
>
>> Is there anything I can do to get Ruby to find these "required"  scripts?
>
> Ruby searches these paths:
>
> ruby -e 'p $LOAD_PATH'
>
> You can use the -I argument or the RUBYLIB environment variable to  add 
> paths to this.  You can also put your extra libraries in your  site_ruby 
> directory.

    Thanks, I went with the environment variable.  It's what I was looking 
for...


>> I tried to call a PERL script from a Ruby script and that myseriously
>> failed.  I did a search on groups.google and found that you need to  call 
>> the PERL interpreter, directly.  I found this a little odd  since PERL 
>> scripts have no problem calling other PERL scripts.   It's not a problem 
>> of the environment, since Ruby can call  executables in the execution 
>> path.
>
> I don't believe you.  Please show us an error.
>
> $ cat x.pl
> #!/usr/bin/env perl
>
> print "hi\n";
>
> $ ruby -e 'system "./x.pl"'
> hi

    Interestingly enough, I remember seeing this on the other post in this 
newsgroup.  This is what this scenario looks like for me:


$cat x.pl
print "hi\n"

$ruby -e 'puts `x.pl`'
-e:1:in ``': Exec format error - x.pl (Errno::ENOEXEC)
    from -e:1


    Of course, in DOS, the command line uses the ">" symbol but I didn't 
want to create any confusion with quoted text.  Of course, the solution was 
to use the "system" method but, really, what's so different with the 
familiar `` operator?  ...Yet you didn't know this nor did you use it in 
your example.  This suggests to me that you don't use this operator anymore. 
Why not?  The "system" call doesn't even return the output of the command 
nor does this output actually reach stdout...