jobs后台任务

前台作业：占据了命令提示符，就是你当前可以操作的作业
后台作业：启动之后，释放命令提示符，后续的操作在后台完成

前台——>后台
　　　　ctrl+z：把正在前台的作业送往后台，这时作业的状态是暂停。
　　　　COMMAND &：执行命令时在后面加个 &，直接让命令在后台运行

★ jobs：查看后台的所有作业，作业号不同于进程号，+代表最近被放置后台的工作，-代表第二个被放置后台的工作
　　-l：把PID也列出来
　　-r：仅列出正在运行的作业
　　-s：仅列出暂停的作业

★ fg [JOBID]：调回后台作业至前台，后面接作业号，用jobs可以看到，默认会把带+号的任务放回前台

★ bg [JOBID]：让后台停止的作业继续进行，在上面说的ctrl+z之后的进程是暂停的，用bg可以让他运行起来

★ nohup 外置命令 &：当你想注销系统后继续进行某些任务可以用nohup，但是不支持bash内置命令。

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jobs后台任务

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