创建一个新的nagcm d组以便外部命令可以通过web界面提交。
Create a new nagcmd group to allow external commands to be submitted through the Web interface.
type命令还显示出，cd是一个内置的命令，并且与外部命令 /usr/bin/cd 是相同的。
The type command also shows that cd is a built-in command and is duplicated externally as /usr/bin/cd.
type命令还显示出，cd是一个内置的命令，并且与外部命令 /usr/bin/cd 是相同的。
The type command also shows that cd is a built-in command and is duplicated externally as /usr/bin/cd.
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