Сценарий Bash: Для входа канала MQTT в файл

Сервисы обычно используют скрипты-оболочки, например;

#!/bin/bash

# Provides: example
# Required-Start:
# Should-Start:
# Required-Stop:
# Default-Start: 2 3 5
# Default-Stop: 0 1 2 6
# Short-Description: example
# Description: example

#
# /etc/init.d/example
#

set -e
trap 'echo "ERROR: $BASH_SOURCE:$LINENO $BASH_COMMAND" >&2' ERR

NPID=$(pgrep -f example2.sh || true);

function start {
    if [ "$NPID" = "" ] ; then
        screen -S example -d -m bash -c '/root/example2.sh'
    else
        echo "example service is already running as $NPID";
    fi
}

function stop {
    if [ "$NPID" != "" ] ; then
        kill "$NPID";
    else
        echo "example service was not running" >&2;
    fi
}

function status {
    if [ "$NPID" = "" ]; then
        echo "example is not running";
    else
        echo "example is running with pid $NPID";
    fi
}

if [ "$1" = "start" ]; then
    start
elif [ "$1" = "stop" ]; then
    stop
elif [ "$1" = "restart" ]; then
    stop;
    start;
elif [ "$1" = "status" ]; then
    status
else
    echo " * Usage: /etc/init.d/example {start|status|stop|restart}";
fi