未定义行为而已。


Environment variable names used by the utilities in the Shell and Utilities volume of POSIX.1-2017 consist solely of uppercase letters, digits, and the <underscore> ( '_' ) from the characters defined in Portable Character Set and do not begin with a digit. Other characters may be permitted by an implementation; applications shall tolerate the presence of such names.



【 在 snnn 的大作中提到: 】
: 所以，我要说的是：可以的！！！！你说的只是 bash 的限制。不是操作系统的。
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FROM 114.247.175.*