How good is oreilly site for learning PERL on Mac??

I am trying to learn perl from oreilly site.
http://www.perl.com/pub/a/2000/10/begperl1.html
Instructions said to save this text in a file.pl (I copied and pasted this into a plain text file and named it as p.pl)
#!/usr/local/bin/perl
print "Hi there!\n";
and go to the directory with the file and run from command line perl file.pl
And nothing happened.
Then tried these things and finally it worked..
#!/usr/bin/env perl
removed whitespace by hitting the delete key..
Not sure what I did but it worked..
Any suggestions how to avoid this problem in the future...
Mac OS X (10.4.1)

Generally, the O'Reilly sites are as good as it gets - they have some of the best technical documentation around, although not necessarily the best for beginners.
In any case, the link you reference does state:
In this series, I'm going to assume that you're using a Unix system and that your Perl interpreter is located at /usr/local/bin/perl.
Like any unix system you need to know a little bit about your environment in order to get the most out of it. In this case perl is not installed in /usr/local/bin and therefore you need to make some adjustments to your scripts.
Mac OS X installs perl in /usr/bin by default, so you should rewrite the first line as:
#! /usr/bin/perl

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Regards
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basic whit easy english.

>
The underlined section demonstrates my problem with
some sites.
I would have taken issue with more of the statement than you underlined...
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itself while explicit cursors are created by the
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normal pl/sql returning more than one rows givens
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RAOTF,LMFAO.
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How good is oreilly site for learning PERL on Mac??

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