PowerShell中的echo和Write-Host有什么区别？

我对PowerShell中的echo和Write-Host之间的区别感到困惑。 我有两个文件， POC.ps1和validatePath.ps1 。 这些文件在我的本地机器上，我正在使用Invoke-Command在远程机器上运行它们。 我正在使用PowerShell v3.0。

要执行这两个脚本，我使用下面的命令：

 .\POC.ps1 -filename C:\Users -user Blaine 

这是两个文件：

POC.ps1：

 param($filename, $user) echo $filename echo "This" echo $user $responseObject = Invoke-Command testcomputer -FilePath .\validatePath.ps1 -ArgumentList($filename, $user) -AsJob while($responseObject.State -ne "Completed") { } $result = Receive-Job -Id $responseObject.Id -Keep echo $result 

这里是奇怪的地方…

validatePath.ps1：

 Param([string] $filename, [string] $user) function ValidatePath( $filename, $user, $fileType = "container" ) { Write-Host "This is the file name: $filename" Write-Host "This is user: $user" <--- Notice I'm using Write-Host here $fileExist = $null if( -not (test-path $filename -PathType $fileType) ) { throw "$user, the path $filename does not exist!" } else { Write-Host "This is the second part" echo $filename found! } Write-Host "This is the third part" return $fileExist } try { ValidatePath($filename, $user) } catch { $e = $_.Exception echo $e } 

当我运行上面的脚本，这是输出：

 C:\Users This Blaine This is the file name: C:\Users Blaine This is user: <--- Notice where this line is? This is the second part This is the third part C:\Users Blaine found! 

但是，如果我将validatePath.ps1更改为：

 Param([string] $filename, [string] $user) function ValidatePath( $filename, $user, $fileType = "container" ) { Write-Host "This is the file name: $filename" echo "This is user: $user" <---notice I'm using Echo here $fileExist = $null if( -not (test-path $filename -PathType $fileType) ) { throw "$user, the path $filename does not exist!" } else { Write-Host "This is the second part" echo $filename found! } Write-Host "This is the third part" return $fileExist } try { ValidatePath($filename, $user) } catch { $e = $_.Exception echo $e } 

这是输出：

 C:\Users This Blaine This is the file name: C:\Users Blaine This is the second part This is the third part This is user: <---- Notice where this line is now? C:\Users Blaine found! 

您会注意到“这是用户：”这一行在不同的地方。 为什么是这样？ 为什么echo工作与Write-Host不同？

更新：

更奇怪的是，如果我像这样重新运行脚本两次：

POC.ps1：

 param($filename, $user) echo $filename echo "This" echo $user $responseObject = Invoke-Command CAPTESTPK01 -FilePath .\validatePath.ps1 -ArgumentList $filename, $user -AsJob while($responseObject.State -ne "Completed") { } $result = Receive-Job -Id $responseObject.Id -Keep echo $result $filename = "C:\saddfasdfj" #Here I run the command again, using a different file name $responseObject = Invoke-Command CAPTESTPK01 -FilePath .\validatePath.ps1 -ArgumentList $filename, $user -AsJob while($responseObject.State -ne "Completed") { if($responseObject.State -eq "Failed") { echo "Failed" $result = Receive-Job -Id $responseObject.Id -Keep echo $result break } } $result = Receive-Job -Id $responseObject.Id -Keep echo $resul 

在validatePath.ps1使用echo时，它给了我这个输出：

 C:\Users This Blaine This is the file name: C:\Users This is the second part This is the third part This is user: Blaine <---- This line is here C:\Users found! This is the file name: C:\saddfasdfj This is user: Blaine <---- But now it's here, where it should be? Wth? Blaine, the path C:\saddfasdfj does not exist!