当找到命令后，通常再按回车键就可以执行该命令。
如果想对找到的命令进行调整后再执行，则可以按一下左或右方向键。
Press Ctrl+R from the command prompt, which will display the reverse-i-search prompt
(reverse-i-search)`red‘: cat /etc/redhat-release
[Note: Press enter when you see your command, which will execute the command from the history]
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