powershell - Removing similar lines from two files

Question

I'm trying to find a PowerShell solution to remove lines from file A that are similar in File B. Compare-Object $A $B does the comparing, but how to I go about deleting the items?

File A

yahoo.com
google.com
stackoverflow.com
facebook.com
twitter.com

File B

stackoverflow.com
facebook.com

After Compare: File A

yahoo.com
google.com
twitter.com

Answer 1

You can remove the contents of file B from file A with something like this:

$ref = Get-Content 'C:pathofileB.txt'

(Get-Content 'C:pathofileA.txt') |
  ? { $ref -notcontains $_ } |
  Set-Content 'C:pathofileA.txt'