The first time you connect to a host, the system asks if you want to keep a copy of the remote hosts public key in your 'known hosts' file (see Listing 5).
您第一次连接到主机时，系统会询问您是否需要将远程主机公钥的副本保存在“已知主机”文件中(请参见清单5)。
The previous command copies the local file /etc/hosts to /tmp/hosts on each machine listed in servers.txt.
前面的命令把本地文件 /etc/hosts 复制到 servers.txt 中列出的每台计算机上的 /tmp/hosts。
Known hosts file (optional field) : The file that contains a list of known hosts.
Known hosts file (optional field)：包含已知主机列表的文件。
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