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In Linux, service scripts are usually located in /etc/init.d/ directory (In CentOS 7, it is /usr/lib/systemd/system/my.service), if we don’t know how to write such script we can always go to that directory and find a ‘template’ for study.

Below is a simple start up service script, it controls the start, restart and stop of Python Flask service:

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#!/bin/sh

host=http://localhost:4000

cur_dir=`pwd`
cur_pid=$$

function start_hexo() {
    test $(pwd) = "/e/god/juniway" || (echo "not in directory /e/god/juniway"; exit 1)
    (hexo g >/dev/null 2>&1 && nohup hexo s &> out 2>&1) & (sleep 6; chrome http://localhost:4000)
}

function stop_hexo() {
    test $(pwd) = "/e/god/juniway" || (echo "not in directory /e/god/juniway"; exit 1)
    ps ux | grep -E '/usr/bin/sh|node' | awk -v var="$cur_pid" '$1!=var{print $1}' | xargs kill >/dev/null 2>&1
    # don't kill current shell, otherwise restart will fail after executing stop_hexo()
}

function restart_hexo() {
    stop_hexo
    start_hexo
}

function status_hexo() {
    echo -e "cur_pid:"$cur_pid"\n"
    ps ux | grep -E '/usr/bin/sh|node'
}

function main() {
    action=$1
    case $action in
        'start')
            start_hexo
            ;;
        'stop')
            stop_hexo
            ;;
        'restart')
            restart_hexo
            ;;
        'status')
            status_hexo
            ;;
        *)
            echo "Bad argument!"
            echo "Usage: $0 {start|stop|restart|status}"
            ;;
    esac
}

main $*