Powershell 文件比较 [英] Powershell File Compare

问题描述

我正在使用 PowerShell 脚本在某些服务器上移动某些文件.我想测试我要移动的文件是否已存在于目标中.不只是同名的文件.

I am using a PowerShell script to move some files around on some servers. I want to test if a file I am going to move already exists in the destination. Not just a file with the same name.

我以为

比较对象 $File1 $File2
应该这样做，但无论文件是什么，它总是返回它们是相同的例如.

Compare-Object $File1 $File2
Should do it but no matter what the files are it always returns that they are the same eg.

InputObject           SideIndicator                              
-----------           -------------                              
D:\1.gif               =>                                         
D:\1.wma               <=    

是否有其他方法可以测试两个文件是否相同?

Is there some other way to test if two files are identical?

推荐答案

我想这取决于你对相同"的定义

I guess it's going to depend on your definition of "The same"

Compare-Object (ls Source\Test.*) (ls Dest\Test.*) -Property Name, Length, LastWriteTime

这将按名称、长度和修改日期比较实际的 FILE 对象.添加 -IncludeEqual 将导致同时显示两个地方相同的内容.

That will compare the actual FILE objects by name, length, and modified date. Adding -IncludeEqual will result in also showing ones that are the same in both places.

如果您只想从源"中复制与目标"中不同的文件，请执行以下操作:

If you want to only copy files from "Source" which aren't the same in the "Destination" just do this:

Compare-Object (ls $Source) (ls $Destination) -Property Name, Length, LastWriteTime -passthru | 
Where { $_.PSParentPath -eq (gi $Source).PSPath } |
Copy-Item $Destination

不要开始编写获取内容的脚本(如其他人所建议的)来进行文件比较——您会将所有内容加载到内存中...

DO NOT start writing scripts that get-content (as suggested by others) to do a file comparison -- you'd be loading everything into memory...

请考虑使用 robocopy(即使它的命令行语法已经过时).=Þ

DO consider using robocopy (even though it's command-line syntax is dated). =Þ

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