PowerShell 中的“ exit”到底是什么？

输入 exit就可以退出 PowerShell。到目前为止还不错。但是这到底是什么呢？

PS Home:\> gcm exit
Get-Command : The term 'exit' is not recognized as the name of a cmdlet, function, script file, or operable program. Ch
eck the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:4
+ gcm <<<<  exit
+ CategoryInfo          : ObjectNotFound: (exit:String) [Get-Command], CommandNotFoundException
+ FullyQualifiedErrorId : CommandNotFoundException,Microsoft.PowerShell.Commands.GetCommandCommand

所以它既不是 cmdlet，也不是函数、脚本或程序。

不幸的是，这也意味着不能为 exit创建别名:

PS Home:\> New-Alias ^D exit
PS Home:\> ^D
Cannot resolve alias '♦' because it refers to term 'exit', which is not recognized as a cmdlet, function, operable prog
ram, or script file. Verify the term and try again.
At line:1 char:2
+ ♦ <<<<
+ CategoryInfo          : ObjectNotFound: (♦:String) [], CommandNotFoundException
+ FullyQualifiedErrorId : AliasNotResolvedException

还有没有其他没有命令的命令？

仅供参考: 我知道我可以简单地把它包装成一个函数，我的配置文件有这些线

# exit with Ctrl+D
iex "function $([char]4) { exit }"