使用Ctrl+Z控制进程
本文介绍了如何在Unix-like系统中使用Ctrl+Z来暂停正在运行的前台进程，并通过发送SIGTSTP信号使其进入后台挂起状态。此外还讲解了如何使用fg和bg命令来恢复已暂停的任务。
本文转自：https://blog.youkuaiyun.com/duyiwuer2009/article/details/43191799
Ctrl+Z - 暂停进程并放入后台
jobs - 显示当前暂停的进程
bg N 使第N个任务在后台运行
fg N 使第N个任务在前台运行
bg, fg 不带 N 时表示对最后一个进程操作
On Unix-like systems, Control+Z is the most common default keyboard mapping for the key sequence that suspends a process.[2] When entered by a user at their computer terminal, the currently running foreground process is sent a "terminal stop" (SIGTSTP) signal, which generally causes the process to suspend its execution. The user can later continue the process execution by using the "foreground" command (fg) or the "background" command (bg).
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