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  1. or download this
    my $code_file = '/tmp/myscript.cmds';
$SIG{HUP} = sub {
...
    warn "Caught HUP signal but unable to process commands: $@";
  }
};
  2. or download this
    > echo "$foo = 27" >> /tmp/myscript.cmds
> killall -HUP perl