How to filter a get-adcomputer command using a text/csv file and output to a CSV

Question

OK, so I'm in the process of trying to get a Windows 7 refresh completed for a large client... I had the bright idea to use AD to find what computers are listed as XP, and determine our progress using that.  Well, I run get-adcomputer, and it returns
the results... a whole lot of results that really aren't active anymore.  I obtained a list of systems that have been disposed of, holding for disposal, etc... now my problem is I can't quite figure out how to get that list to be used to exclude those
computers from the results... I execute my script, it runs, but it seems to get stuck in a loop... I'm sure I'm missing something VERY basic, but I can't figure it out.  This is the first time I've ever attempted to use the get-content commandlet, so
again, I'm sure I'm doing something stupid. 
Any help will be greatly appreciated!
import-module ActiveDirectory
$exclude = get-content c:\scripts\excludes.csv
ForEach ($entry in $Exclude)
$Excl = "*$entry*"
get-adcomputer -filter {Name -notlike $excl} | select Name,operatingsystem
} Export-CSV c:\scripts\xpfil.csv

Answer 1

OK, this one with a little tweaking on my excludes.txt worked... I'd really like to know what the
?{$a -notcontains $_.name}
is doing... Step through it if you can... that way next time I'm not beating my head against this same rather solid wall!
? is an alias for Where-Object. I avoid using aliases in posts, as they usually confuse people.
The concept is that you're reading your exclude list into a variable and then verifying that the variable doesn't contain the computer name that you're currently processing in the pipeline. In my case, I'm running each object through a ForEach-Object loop.
Make sense?
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