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Difference between or and || in Perl

• Use || / && when you want to assign or return the result of the expression
• Use 'or' / 'and' when you only need to evaluate the truth or falseness, e.g. for an if statement

See also Perl Operator Precedence

Pretty print Data::Dumper, with variable names

use Data::Dumper;

$Data::Dumper::Indent = 1; # pretty print

Data::Dumper->Dump([\@debug_log],['debug_log']); # name the variable