Level goal
The password for the next level is stored in a file called "-" located in the home directory
Login
ssh bandit1@bandit.labs.overthewire.org -p 2220
ZjLjTmM6FvvyRnrb2rfNWOZOTa6ip5If
Doc
cat (1) - concatenate files and print on the standard output
Solution
Using the redirecting operator < when can feed "-" to cat in order to see the contents of the file.
bandit1@bandit:~$ cat < -
263JGJPfgU6LtdEvgfWU1XP5yac29mFx