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It's all about operator precedence. For more information about precedence theory checkout perlop.
Regarding your specific problem:
The line  open ($fh,$log) || $down = 'moo'
is evaluated as (open ($fh,$log) || $down) = 'moo';
Obviously, open isn't an lvalue function; you can't assign it a value.
$log = "moooojlfdkafj.txt"; $down="false"; open (FH, $log) || ( $down = "true" ); print $down;
or
$log = "moooojlfdkafj.txt"; $down="false"; open (FH, $log) or $down = "true"; print $down;
work.

Gyan Kapur

In reply to Re: open failure code by Revelation
in thread open failure code by RolandGunslinger

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