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Re: perl deprecated functions and alike

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February 15, 2009 04:08
Re: perl deprecated functions and alike
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On Sun Feb 15 2009 @  9:45, Octavian Râsnita wrote:
> From: "John W. Krahn" <>
>> Kevin wrote:
>>> Could someone please direct me to some web pages where I can go 
>>> through all deprecated perl functions and/or ways of writing perl 
>>> script?  It is not easy for me to figure out whether an on-line 
>>> example is deprecated or not.  I once saw:
>>> @files = <$path_to_directory>
>>> on the web and found it worked perfectly, then kept using this way of 
>>> writing my perl script.  But I was told yesterday such a script is  
>>> deprecated now.
>> AFAIK that is not deprecated.
> Can you explain how it works?
> I have tried the script below, and of course it doesn't print anything:
> use strict;
> my $path_to_directory = '/';
> my @files = <$path_to_directory>;
> foreach my $file(@files) {
> print "$file\n";
> }
> Thanks.
> Octavian

Yup, I'm confused as well. At first, I thought it was the alternative way
to write glob( $path_to_directory ), but not exactly. 

According to perldoc perlop, @files = <$path_to_directory > (note the extra
space) will work as a glob, but otherwise, the interpreter thinks that you
are trying to run readline on an unopened filehandle. Running a short test
script with 'diagnostics' enabled, I get this: 

  readline() on unopened filehandle $path at files line 7 (#1)
      (W unopened) An I/O operation was attempted on a filehandle that was
      never initialized.  You need to do an open(), a sysopen(), or a socket()
      call, or call a constructor from the FileHandle package.
	    (Are you trying to call readline() on dirhandle $path?)

So, I would also be curious to know what that construction is supposed to do.

Thanks, T

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