well not quite, type
that will prompt you for the root user passwd, you now have 'super user' power, you can read/write/delete anything on the system, be careful.
now you can type
and all should go well.
as for books I suggest browsing the forums, using http://www.google.com/linux,
and I think O'Riley may have some good linux guides that cover commands, tricks. etc.... Also search google for linux tutorials and things of this nature.