how to show lines in common (reverse diff)?

Question

I have a series of text files for which I\'d like to know the lines in common rather than the lines which are different between them. Command line unix or windows is fine.

Answer 1

In Windows you can use a Powershell Script with CompareObject

compare-object -IncludeEqual -ExcludeDifferent -PassThru (get-content A.txt) (get-content B.txt)> MATCHING.txt | Out-Null #Find Matching Lines

CompareObject:

• IncludeEqual without -ExcludeDifferent : Everything
• ExcludeDifferent without -InclueEqual : Nothing