使用PowerShell比较不同的文件扩展名和复制文件

Question

场景：文件夹1中的*.pdf文件夹2中的*.rtf，两个文件夹的文件名相同，但扩展名不同。需要比较这两个文件夹，并仅将*.rtf从Folder2复制到Folder3。

脚本：

    Compare-Object (Get-childitem $Folder1 -Recurse | foreach-object {$_.basename}) (Get-childitem $Folder2 -Recurse | foreach-object {$_.basename})     -Property RelativePath, Name, Length |
Sort RelativePath, Name, Length -desc | % {
if ($file -ne $_.RelativePath)
{ $_ }
$file = $_.RelativePath
} | Where-Object {$_.SideIndicator -eq "=>"} | ForEach-Object {Copy-Item ("$Folder2" + $file) -Destination ("$Folder3" + $file) -Force}

Answer 1

通常情况下，您应该有一个问题。我不确定你从哪里得到属性RelativePath，所以我介绍了这个应该很容易理解。我本可以把它变成一个单行命令，但同样，它更可读。

$Folder1 = "C:tempfolder1"
$Folder2 = "C:tempfolder2"
$Folder3 = "C:tempfolder3"
$Folder1Contents = Get-childitem $Folder1 -Recurse -Include *.pdf
$Folder2Contents = Get-childitem $Folder2 -Recurse -Include *.rtf
Compare-Object $Folder1Contents $Folder2Contents -Property BaseName -PassThru | Where-Object{$_.SideIndicator -eq "=>"} | Move-Item -Destination $Folder3 -Force -WhatIf

将$Folder1中的pdf文件与$Folder2中的rtf文件进行比较。如果$Folder2中有.rtf文件，则它将被移动到$Folder3。-Force将覆盖该目录中预先存在的文件，因此在完成测试后删除-WhatIf。

Answer 2

最终结果：我添加了一个用于日志记录的Transcript和if/elseif语句。双重比较对象只是为了使比较结果显示在日志中。谢谢你的帮助马特，你帮我省去了几个小时的头痛。

$Folder1 = "C:tempfolder1"
$Folder2 = "C:tempfolder2"
$Folder3 = "C:tempfolder3"    
$log = "C:logscompare.log"
$ErrorActionPreference="SilentlyContinue"
Stop-Transcript | out-null
$ErrorActionPreference = "Continue"
$OutputFileLocation = "$log"
Start-Transcript -path $OutputFileLocation -append

$folder1contents = Get-childitem $folder1 -Recurse -Include *.pdf
$folder2contents = Get-childitem $folder1 -Recurse -Include *.rtf
$filecheck = "C:tempfolder1*.pdf"
$filepresent = Test-Path $filecheck
if ($filepresent -eq $false) 
{ 
Write-host "No Files To Compare" 
}
elseif  ($filepresent -eq $true) 
{
Compare-Object $folder1contents $folder2contents -Property BaseName -PassThru
Compare-Object $folder1contents $folder2contents -Property BaseName -PassThru | Where-Object{$_.SideIndicator -eq "=>"} | Copy-Item -Destination $folder3 -Force 
}
stop-transcript