I have 1 file of emaiils (4.6m lines) I have another file of emails (100m lines).
I want to see how many of these 4.6m lines occur in the file which has 100m lines.
I've researched already, and tried the following:
"grep -f file1 file2 > output.txt" < to no avail.
"grep -wFf file1 file2 > output.txt" < to no avail.
I'm using Cygwin for this, and both of the above commands "run" (there's no error mesage" then after X amount of time it's finished and nothing has been outputted to "output.txt"