start-stop-daemon自動啟動、關閉后台程序參數傳遞

/*************************************************************************
 *          start-stop-daemon自動啟動、關閉后台程序參數傳遞
 * 說明：
 *     看了使用start-stop-deamon啟動腳本，沒看到怎么傳遞參數的，測試一下怎么
 * 使用。
 *                              
 *                                      2017-10-11 深圳 南山平山村 曾劍鋒
 ************************************************************************/

一、參考文檔：
    1. start-stop-daemon(8)
        http://man7.org/linux/man-pages/man8/start-stop-daemon.8.html

二、傳遞參數：
    1. -S, --start [--] arguments
              Check for the existence of a specified process.  If such a
              process exists, start-stop-daemon does nothing, and exits with
              error status 1 (0 if --oknodo is specified).  If such a
              process does not exist, it starts an instance, using either
              the executable specified by --exec or, if specified, by
              --startas.  Any arguments given after -- on the command line
              are passed unmodified to the program being started.
    2. 如上所述，在--之后加入命令行參數：
        start-stop-daemon -S -b -x /usr/sbin/httpd -- -h /var/www
        
三、示例：
    cat /etc/init.d/S71httpd
        #! /bin/sh
        
        set -e
        
        DESC="httpd"
        NAME=httpd
        DAEMON=/usr/sbin/$NAME
        
        case "$1" in
          start)
                printf "Starting $DESC: "
                start-stop-daemon -S -b -x $NAME -- -h /var/www
                echo "OK"
                ;;
          stop)
                printf "Stopping $DESC: "
                start-stop-daemon -K -x $NAME
                echo "OK"
                ;;
          restart|force-reload)
                echo "Restarting $DESC: "
                $0 stop
                sleep 1
                $0 start
                echo ""
                ;;
          *)
                echo "Usage: $0 {start|stop|restart|force-reload}" >&2
                exit 1
                ;;
        esac
        
        exit 0