Re^3: Here there be camels!


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Re^3: Here there be camels!

by Discipulus (Canon)

on Mar 01, 2015 at 08:51 UTC ( [id://1118243]=note: print w/replies, xml )

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in reply to Re^2: Here there be camels!
in thread Here there be cammels!

I do not think is a bug: is a edge case of use of very particular features...
diamond <> never close the handle and __DATA__ is very near to be $0 in this case (if i remember you can seek it and print the main program too). Because you can adjust $. and you had not closed DATA handle you end with the beahviour observed.
from perldata

Text after __DATA__ may be read via the filehandle PACKNAME::DATA , where PACKNAME is the package that was current when the __DATA__ token was encountered. The filehandle is left open pointing to the line after __DATA__. The program should close DATA when it is done reading from it.

PS. thanks for the line directive hint: never eard about..
L*

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Re^4: Here there be camels!
by Anonymous Monk on Mar 01, 2015 at 13:04 UTC

Using DATA was just an example, the same thing happens on a normal filehandle too.

system 'echo "foo" >/tmp/blah';   
open my $fh, '<', '/tmp/blah' or die $!;
while (<$fh>) { chomp; warn "<$_>"; }
warn "One";
$. = 123;
warn "Two";
close $fh;
warn "Three";
$. = 456;
warn "Four";
__END__
<foo> at - line 3, <$fh> line 1.
One at - line 4, <$fh> line 1.
Two at - line 6, <$fh> line 123.
Three at - line 8.
Four at - line 10, <$fh> line 456.
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So LanX is probably right about it being more of a bug than an obscure feature :-)

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