Compare-Object and Get the name of object/File?

06-16-08, 11:09 PM

akcorr

I want to compare two directories and copy the files that are not in
directory $A to directory $B. My initial try to see what I get back:

$A = Get-ChildItem -path C:\test1
$B = Get-ChildItem -path C:\test2

$C = Compare-Object $A $B

ForEach ($f in $C)
{
Write-Host $f
}

It Spit back this:

@{InputObject=test.txt; SideIndicator=<=}
@{InputObject=test2.txt; SideIndicator=<=}
@{InputObject=test3.zip; SideIndicator=<=}
@{InputObject=test4.txt; SideIndicator=<=}

How would I got about extracting the fullnames for each of those files?
After that I can pass it to a function for work to be done.

06-17-08, 02:10 AM

Marco Shaw [MVP]

akcorr wrote:
> I want to compare two directories and copy the files that are not in
> directory $A to directory $B. My initial try to see what I get back:
>
> $A = Get-ChildItem -path C:\test1
> $B = Get-ChildItem -path C:\test2
>
> $C = Compare-Object $A $B

> How would I got about extracting the fullnames for each of those files?
> After that I can pass it to a function for work to be done.

I'd skip the foreach loop:

PS > $C|ForEach-Object{$_.InputObject}|ForEach-Object{$_.FullName}
C:\test2\bar.txt
C:\test1\foo.txt
PS >

That could also be more simply:
$C|ForEach-Object{($_.InputObject).FullName}

Hope that helps...

Marco

06-17-08, 11:01 AM

Shay Levi

Hi akcorr,

compare-Object $A $B | select InputObject

Make sure to read Dmitry's post on the -syncWindow parameter:
http://dmitrysotnikov.wordpress.com/...object-gotcha/

06-17-08, 02:24 PM

/\/\o\/\/ [MVP]

a> I want to compare two directories and copy the files that are not in
> a> directory $A to directory $B.

Another way to do this from PowerShell that might be interesting :

copy c:\test1\*.* c:\test2 -Exclude (dir c:\test2) -WhatIf

Greetings /\/\o\/\/

"Shay Levi" wrote:
[..]

06-17-08, 03:26 PM

Shay Levi

Definitely!

06-19-08, 11:15 AM

Chris Warwick

On Tue, 17 Jun 2008 06:24:01 -0700, /\/\o\/\/ [MVP]
<oMVP> wrote:

>a> I want to compare two directories and copy the files that are not in
>> a> directory $A to directory $B.
>
>Another way to do this from PowerShell that might be interesting :
>
>copy c:\test1\*.* c:\test2 -Exclude (dir c:\test2) -WhatIf
>
>Greetings /\/\o\/\/
>

To list the files that would be copied:

robocopy c:\test1 c:\test2 /l

Remove /l to actually copy the files....

:-)

Similar Threads
Thread	Thread Starter
Convert File Object into Class Object is there any way to convert a java object of type File to type Class? my problem is that want to scan a directory and find files that ends with ".class" and treat them as...	Aned
Testing object arrays using Compare-Object and -contains I'm having trouble finding a simple scheme for getting all objects which are members of a set B but not also members of another set A. The specific real problem is a tool...	Alex K. Angelopoulos [MVP]
Object creation - Do we really need to create a parent for a derieved object - can't the base object just point to an already created base object OK! I had this nagging doubt Consider (without worrying abt access specifiers) class Kid : public Parent{...}; Parent::someFunc() { Kid k; }	jon wayne
PowerPoint VBA - Picture Object, OLE Object file extension, type, or format I am writing an add-in that loops through a PowerPoint application and exports all the included images. The problem is when I export the image I need to specify a format...	AD
Problem : To link a .cpp main file with a C object(.o) and C++ object(.o) using xlc compiler We are trying to link a .cpp main file with a C object(.o) and C++ object(.o) using xlC compiler on IBM-AIX. Please let us know, if anyone has a solution to this problem...	GyungChan