windows $之间的区别？和 $LastExitCode 在 PowerShell 中
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Difference between $? and $LastExitCode in PowerShell
提问by Colonel Panic
In PowerShell, what is the difference between $?and $LastExitCode?
在 PowerShell 中，$?和之间有什么区别$LastExitCode？
I read about automatic variables, and it said:
我读了关于自动变量，它说：
$? 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.
$? 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.
In the definition of $?it doesn't explain what succeed and fail mean.
在$?它的定义中并没有解释成功和失败的含义。
I ask because I presumed that $?is True if and only if $LastExitCode is 0, but I found a surprising counter-example: $LastExitCode=0 but $?=False in PowerShell. Redirecting stderr to stdout gives NativeCommandError.
我问是因为我认为$?当且仅当 $LastExitCode 为 0 时它才是 True，但我发现了一个令人惊讶的反例：$LastExitCode=0 但 $?=False 在 PowerShell 中。将 stderr 重定向到 stdout 会给出 NativeCommandError。
回答by Joey
$LastExitCodeis the return code of native applications. $?just returns Trueor Falsedepending on whether the last command (cmdlet or native) exited without error or not.
$LastExitCode是本机应用程序的返回码。$?只返回True或False取决于最后一个命令（cmdlet 或本机）是否无错误退出。
For cmdlets failure usually means an exception, for native applications it's a non-zero exit code:
对于 cmdlet 失败通常意味着异常，对于本机应用程序，它是一个非零退出代码：
PS> cmd /c "exit 5"
PS> $?
False
PS> cmd /c "exit 0"
PS> $?
True
Cancelling a cmdlet with Ctrl+Cwill also count as failure; for native applications it depends on what exit code they set.
使用Ctrl+取消 cmdletC也算作失败；对于本机应用程序，这取决于它们设置的退出代码。
