如何在 Linux 上使用 bash 或 python 生成分离的后台进程
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How to spawn detached background process on Linux in either bash or python
提问by Marc
I have a long running python script on Linux, and in some situations it needs to execute a command to stop and restart itself. So, I would like to have an external script (either in bash or python) that executes command to restart the original script. Let me elaborate.
我在 Linux 上有一个长时间运行的 python 脚本，在某些情况下它需要执行一个命令来停止和重新启动自己。所以，我想要一个外部脚本（在 bash 或 python 中）来执行命令以重新启动原始脚本。让我详细说明一下。
Suppose I have original_script.py. In original_script.py I have this in an infinite loop:
假设我有 original_script.py。在 original_script.py 我有一个无限循环：
if some_error_condition:
somehow call external script external.sh or external.py
Let's suppose I can call external.sh and it contains this:
假设我可以调用 external.sh 并且它包含以下内容：
#!/bin/bash
command_to_restart_original_script
Finally, I know the command "command_to_restart_original_script". That isn't the problem. What need is the python command to "somehow call external script external.sh". I need the external script (which is a child process) to keep running as the parent process original_script.py is restarting, ie I need the child process to be detached/daemonized. How do I do this?
最后，我知道命令“command_to_restart_original_script”。那不是问题。需要的是python命令“以某种方式调用外部脚本external.sh”。我需要外部脚本（它是一个子进程）在父进程 original_script.py 重新启动时继续运行，即我需要分离/守护子进程。我该怎么做呢？
回答by Marc
I found lots of suggestions in various places, but the only answer that worked for me was this: How to launch and run external script in background?
我在各个地方找到了很多建议，但唯一对我有用的答案是： 如何在后台启动和运行外部脚本？
import subprocess
subprocess.Popen(["nohup", "python", "test.py"])
In my case I ran a script called longrun.sh so the actual command is:
就我而言，我运行了一个名为 longrun.sh 的脚本，因此实际命令是：
import subprocess
subprocess.Popen(["nohup", "/bin/bash", "longrun.sh"])
I tested this using this run.py:
我使用这个 run.py 对此进行了测试：
import subprocess
subprocess.Popen(["nohup", "/bin/bash", "longrun.sh"])
print "Done!"
and I verified (using ps -ax | grep longrun) that longrun.sh does indeed run in the background long after run.py exits.
并且我验证（使用 ps -ax | grep longrun）longrun.sh 确实在 run.py 退出后很久确实在后台运行。
