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export DEBUGGING=1
perl -Mbegin yourscript.pl

perl -Mbegin=VERBOSE yourscript.pl

perl -Mbegin=all yourscript.pl

======= yourscript.pl ===================

...
# code that's always compiled and executed

========================================

my $foo = 2;

...
=cut

warn "normal foo = $foo\n";

my $foo = 2;

...
}

warn "normal foo = $foo\n";