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# this reports a problem if func() fails.
func $arg1, $arg2 or warn "error invoking func()";
...
# Not what you might expect
# this invokes func( $arg1, ($arg2 || warn "error invoking func()" );
func $arg1, $arg2  || warn "error invoking func()";

# At the top of the file in the configuration section
my $first_backup = 1;
...
        die( Invalid status '$status' from first backup component" );
    }
}