PS 1可以包含其他shell和环境变量、置换命令运算(通过反引号)和特殊的字面值。

PS1 can contain other shell and environment variables, in-place command evaluation (via backquotes), and specialized literals. Here's an initial example.

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后一种方法实现相同的目标，它展示了置换命令运算可以有多么复杂。

This next technique achieves the same goal but demonstrates how complex an in-place command evaluation can be. If you set the prompt to the string.

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结合递归运算，设计了基于MDA置换的信息加密、解密算法。

Combined with recursion operation, an encrypting and decrypting based on MDA disorder information are designed.

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