linux 脚本中的 start-stop-daemon 是什么？
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What is start-stop-daemon in linux scripting?
提问by Rajeev Das
What is start-stop-daemon and how should it be used?
什么是 start-stop-daemon，应该如何使用？
I am trying to automate a particular program to run. Whenever the system starts, the program should run. For that I am writing script in /etc/init.d/location.
我正在尝试自动运行特定程序。每当系统启动时，程序就应该运行。为此，我正在/etc/init.d/现场编写脚本。
采纳答案by Burhan Khalid
It is a program to manage the start and stop of system level background processes (daemons). You use it by passing in parameters (such as the pid file to create/check) and command arguments for the process you want to launch.
它是一个管理系统级后台进程（守护进程）启动和停止的程序。您可以通过传入参数（例如要创建/检查的 pid 文件）和要启动的进程的命令参数来使用它。
Then, you do one of two things:
然后，您执行以下两项操作之一：
start-stop-daemon -S [other arguments] something
start-stop-daemon -S [other arguments] something
start something, if somethingwasn't already running. If it was running, do nothing.
start something，如果something还没有运行。如果它正在运行，则什么都不做。
start-stop-daemon -K [other arguments] something
start-stop-daemon -K [other arguments] something
stop something. If somethingwasn't running, do nothing.
停止something。如果something没有运行，什么都不做。
The man pageprovides more information on the various arguments. Typically a template is provided in /etc/init.d/which has other commands for the init process that controls the running of background processes.
该手册页提供了有关的各种参数的更多信息。通常会提供一个模板，/etc/init.d/其中包含用于控制后台进程运行的 init 进程的其他命令。
What does it mean?
这是什么意思？
start-stop-daemon --start --background -m --oknodo --pidfile ${PIDFILE} --exec ${DAEMON} -- ${TARGETDIR}
start-stop-daemon --start --background -m --oknodo --pidfile ${PIDFILE} --exec ${DAEMON} -- ${TARGETDIR}
--background= launch as a background process-m= make a PID file. This is used when your process doesn't create its own PID file, and is used with--background--oknodo= return0, not1if no actions are taken by the daemon--pidfile ${PIDFILE}= check whether the PID file has been created or not--exec= make sure the processes are instances of this executable (in your case,DAEMON)
--background= 作为后台进程启动-m= 制作一个 PID 文件。这在您的进程不创建自己的 PID 文件时使用，并与--background--oknodo= return0，1如果守护进程没有采取任何行动，则不会--pidfile ${PIDFILE}= 检查 PID 文件是否已创建--exec= 确保进程是此可执行文件的实例（在您的情况下，DAEMON）
回答by Basile Starynkevitch
Copy the /etc/init.d/skeletonfile(to e.g. /etc/init.d/rajeevdaemonor another good name), which is a shell script with a lot of comments, and edit it to suit your needs. Then add appropriate symlinks from e.g. /etc/rc2.d/S98rajeevdaemonand /etc/rc2.d/K98rajeevdaemonto it.
复制/etc/init.d/skeleton文件（例如/etc/init.d/rajeevdaemon或其他好名字），这是一个带有大量注释的 shell 脚本，然后编辑它以满足您的需要。然后从 eg/etc/rc2.d/S98rajeevdaemon和/etc/rc2.d/K98rajeevdaemon到它添加适当的符号链接。
Read more about runlevels.
阅读有关运行级别的更多信息。
And recent (or future) Linux distributions are using more and more systemd
最近（或未来）Linux 发行版正在使用越来越多的systemd
