遇到一个棘手的需求，需要在后端跑到爬虫进程
刚开始是这样的,在后面加 &
$ ./test.sh &
关掉shell依然后kill掉进程，后来发现其父进程还是当前终端shell的进程，而一旦父进程退出，则会发送hangup信号给所有子进程，子进程收到hangup以后也会退出。如果要在退出shell的时候继续运行进程，则需要使用nohup忽略hangup信号，或者setsid将将父进程设为init进程(进程号为1)
详细代码是这样的：
$nohup ./test.sh & $echo $$ 21734 $ nohup ./test.sh & [1] 29016 $ ps -ef | grep test 515 29710 21734 0 11:47 pts/12 00:00:00 /bin/sh ./test.sh 515 29713 21734 0 11:47 pts/12 00:00:00 grep test $ setsid ./test.sh & [1] 409 $ ps -ef | grep test 515 410 1 0 11:49 ? 00:00:00 /bin/sh ./test.sh 515 413 21734 0 11:49 pts/12 00:00:00 grep test
安装screen
yum install -y screen
输入screen，然后输入你要运行的命令
ctrl+A 然后按D，screen会关闭
查看正在运行的程序
screen -ls
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