I have 2 files File1.txt:
Column1 | Column2 username2 | timestamp username1 | timestamp username4 | timestamp
Column1 | Column2 username1 | timestamp username3 | timestamp username2 | timestamp
I want to output where they have matching Column1 values into a new file just showing Column1 content. Those values in Column1 are not always in the same order between file1.txt and file2.txt and some entries will be missing from either file.