Command shells unlock the potential of a UNIX system, and bash is the Linux shell.

命令shell开启了UNIX系统的潜能，而bash正是这个Linux shell。

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It was inspired by the Unix operating system, so there was a simplicity, some might say terseness, to its command design.

它的设计灵感来自于Unix操作系统，因此它的命令的设计比较简单，或者说是比较简洁。

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This, therefore, is not equivalent to the system specified cp command in UNIX.

因此，此函数与 UNIX 中系统指定的 cp 命令并不等效。

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