Command line: ./srcds_run -game left4dead2 +98.214.102.130 +map c1m1_hotel
or maybe just: ./srcds_run -game left4dead2 +map c1m1_hotel
How to set up a l4d2 server on Linux « Shazbot Blog.
This is an updated version of setting up a Left 4 Dead 2 server on a Linux box.