The password for the next level is stored in the file data.txt and is the only
line of text that occurs only once
ssh bandit8@bandit.labs.overthewire.org -p 2220
pwd: cvX2JJa4CFALtqS87jk27qwqGhBM9plV
sort data.txt | uniq -u
UsvVyFSfZZWbi6wgC7dAFyFuR6jQQUhR
UsvVyFSfZZWbi6wgC7dAFyFuR6jQQUhR