Grab Nemeth, et al's "UNIX and Linux System Administration Handbook" from your favorite online bookseller and work through each chapter. That'll get you basic fluency with the Unix command line and common administration tasks.
Beyond that, what you need to know really depends on the tech stack of the company you're planning to work for. I'd suggest at least working through the tutorials on how to set up and configure Apache, Tomcat, MySQL and the JRE enough to get a simple web site up and running.
Grab Nemeth, et al's "UNIX and Linux System Administration Handbook" from your favorite online bookseller and work through each chapter. That'll get you basic fluency with the Unix command line and common administration tasks.
Beyond that, what you need to know really depends on the tech stack of the company you're planning to work for. I'd suggest at least working through the tutorials on how to set up and configure Apache, Tomcat, MySQL and the JRE enough to get a simple web site up and running.
Good luck.