Swap and Passwords

[Brian Lehr]

I finally got my swap file working.  When the system boots, the message
is as follows: 
Adding Swap: 48156 swap-space (priority -1)

What does the priority -1 mean?

In regards to passwords, how do I, as root, find the login passwords of
all of my users?  My son went to login today, but forgot his password. 
We set up another one, but how where do I look to find the list?  I
checked the /etc/passwd files, but they're all shadowed or encrypted.

Brian