PowerShell 中 $? 和 $LastExitCode 的区别

在 PowerShell 中，$?和 $LastExitCode的区别是什么？

$? Contains the execution status of the last operation. It contains TRUE if the last operation succeeded and FALSE if it failed.

$LastExitCode Contains the exit code of the last Windows-based program that was run.

在 $?的定义中，它没有解释什么是成功和失败。

我这样问是因为我假设 $?是 True 当且仅当 $LastExitCode 是0，但我发现了一个令人惊讶的反例: $LastExitCode = 0 but $? = False in PowerShell 把 stderr 重定向到 stdout 会导致 NativeCommandError 。

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最佳答案

$LastExitCode is the return code of native applications. $? just returns True or False depending on whether the last command (cmdlet or native) exited without error or not.

For cmdlets failure usually means an exception, for native applications it's a non-zero exit code:

PS> cmd /c "exit 5"
PS> $?
False
PS> cmd /c "exit 0"
PS> $?
True

Cancelling a cmdlet with Ctrl+C will also count as failure; for native applications it depends on what exit code they set.