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Re: My habitual errors (are with open)

by grinder (Bishop)
on Apr 04, 2007 at 19:28 UTC ( [id://608358]=note: print w/replies, xml ) Need Help??


in reply to My habitual errors

I get a couple with open. These days, I've expunged globs from my file handling code, and now use lexicals exclusively. That is, I write:

  open my $fh, '<', $file or die...

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as opposed to

  open IN, '<', $file or die ...

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so the mistake I find myself now making regularly is:

  my $fh = open # *pauses*

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and I realise I've messed up and start the line over. Still, at least I catch that as I'm writing it. This is an improvement over the previous situation, where I would regularly write:

  open IN "< $file" or die ...

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And not spot anything was amiss until I ran the code and the compiler complained about syntax errors. Some say that's progress...

• another intruder with the mooring in the heart of the Perl

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Re^2: My habitual errors (are with open)
by Moron (Curate) on Apr 05, 2007 at 14:48 UTC
    I found that open my $fh doesn't even work for older versions of Perl and have to do something like open \*FH, "blah"; my $fh = \*FH; for old Perls which has a similar effect as the embedded my $fh but isn't quite the same as the erm a bit barer globs you are talking about... But to make code portable between versions without those hardcoded globs, the only way I could think of is something like:
    use FileHandle;
my $fh = new FileHandle "< $file"; 
$fh -> open;

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    It just so happens that this way you can put your $fh on the left after all. Unfortunately, for anonymous pipes your point of confusion moves a bit rather than disappears... 
    use FileHandle;
my $ph = new FileHandle "ps -ef |";
my $pid = $ph -> open; # and you're sort of back where you started.

    [download]

    -M

    Free your mind

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