我正在尝试在PowerShell脚本中运行一些命令提示符命令,例如 schtasks 。我想知道如何处理PowerShell中命令所引发的错误。
I am trying to run a few command prompt commands like schtasks within a PowerShell script. I would like to know how to handle errors thrown by the command in PowerShell.
我尝试过:
- & cmd.exe / c’schtasks / Query / TN xx || echo ERROR’
- & cmd.exe / c‘ping.exe 122.1.1.1&&出口0 ||出口1'
- Invoke-Expression -Command:$ command
- & cmd.exe /c 'schtasks /Query /TN xx || echo ERROR'
- & cmd.exe /c 'ping.exe 122.1.1.1 && exit 0 || exit 1'
- Invoke-Expression -Command:$command
我无法运行这些命令,也无法在 try..catch 块中忽略或捕获异常PowerShell脚本。我知道有库,但仅限于PowerShell v2.0。
I'm unable to run these commands and ignore or catch exception in a try..catch block of the PowerShell script. I know there are libraries but I'm limited to PowerShell v2.0.
推荐答案外部命令通常设置非零退出代码因错误而终止,因此您可以检查自动变量 $ LASTEXITCODE 具有非零值:
External commands usually set a non-zero exit code if they're terminating with an error, so you could check if the automatic variable $LASTEXITCODE has a non-zero value:
& cmd /c 'schtasks /Query /TN xx' if ($LASTEXITCODE -ne 0) { 'an error occurred' }但是请注意,有些程序使用非零退出代码获取非错误信息(例如 robocopy (使用退出代码低于8的状态信息),或 choice (使用退出代码表示所选的选项)。
Note, however, that there are some programs that use non-zero exit codes for non-error information, (e.g. robocopy, which uses the exit codes below 8 for status information, or choice, which uses the exit code to indicate the chosen option).
可以通过在CMD中重定向错误输出流来抑制外部命令的错误消息:
Error messages of the external command can be suppressed by redirecting the error output stream, either in CMD:
& cmd /c 'schtasks /Query /TN xx 2>nul'或在PowerShell中:
or in PowerShell:
& cmd /c 'schtasks /Query /TN xx' 2> $null更多推荐
在PowerShell脚本中处理命令提示符错误
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