kill $pid;

You are missing an argument to kill. You need to specify the signal to send to the pid, either as a string , 'TERM' or 'KILL' or as a number: 2 or 9;

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
"Too many [] have been sedated by an oppressive environment of political correctness and risk aversion."

In reply to Re^3: end "system" by BrowserUk
in thread end "system" by PierreL

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