Level Goal
There are 2 files in the homedirectory: passwords.old and passwords.new. The password for the next level is in passwords.new and is the only line that has been changed between passwords.old and passwords.newNOTE: if you have solved this level and see ‘Byebye!’ when trying to log into bandit18, this is related to the next level, bandit19
So we have two files with a line different between them.
This sounds like a perfect time to use diff.
Diff will show us the difference between file1 and file2 respectively.
In this case, I will look at the difference between passwords.old and passwords.new

We have two strings that look like they could be the key. Assuming that passwords.old was changed to passwords.new, the second flag should be correct.