在服务器上，为了退出终端，程序依然能够运行，需要设置程序在后台运行。
关键的命令：nohup
基本用法：
进入要运行的py文件目录前
nohup python -u test.py > test.log 2>&1 &
含义解释：
nohup 不挂起的意思
python test.py python运行test.py文件
-u 代表程序不启用缓存，也就是把输出直接放到log中，没这个参数的话，log文件的生成会有延迟
test.log 将输出日志保存到这个log中
2>1 2与>结合代表错误重定向，而1则代表错误重定向到一个文件1，而不代表标准输出；
2>&1 换成2>&1，&与1结合就代表标准输出了，就变成错误重定向到标准输出.
& 最后一个& ，代表该命令在后台执行
命令运行后会有提示，示例：
[1] 2880
代表进程2880中运行。
查看nohub命令下运行的所有后台进程：
jobs
查看后台运行的所有进程：
ps -aux
查看后台运行的所有python 进程：
ps aux |grep python
或者
ps -ef | grep python
删除进程
kill -9 [进程id]
-9 的意思是强制删除
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