When a process group becomes an orphan, its processes are sent a SIGHUP signal.

为了防止这类问题的产生，于是就有了孤儿进程组的概念。

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To re-process the sshd_config file, send the SIGHUP command to the sshd (ssh server daemon) process.

为了重新处理 sshd_config 文件，发送 SIGHUP 命令到 sshd （ssh 服务器守护）进程。

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The signal SIGHUP forces xinetd to re-read its configuration and potentially close connections based on new parameters. The command to use is.

信号sighup让xinetd重新读取它的配置，并且根据新的参数，可能会关闭连接。

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