Online References

Linux

1 – Linux Fundamentals
2 – System Administration
3 – Network Administration
4 – Shell Scripting
5 – Linux Internals
6 – Elective Courses

Programming

1 – Learning GNU C
2 – JAVA Programming in Science
3 – Learning the Java Language SUN
4 – Fast Track For SCJP
5 – Java Unleashed
6 – Java By Example, by Clayton Walnum
7 – Java, by Michael Morrison, Second Edition
8 – Java Developer’s Reference
9 – Java Developer’s Guide by Jamie Jaworski
10 – Java Script Manual of Style, by Marc Johnson
11 – Presenting Java Beans
12 – Special Edition Using Java, 2nd Edition
13 – Web Programming with Java, by Michael Girdley, Kathryn A Jones
14 – Creating Web Applets with Java
15 – Thinking In Java 2nd Edition
16 – How To Think Like A Computer Scientist With Java

Certification & Mocks

Java SE – Basic exam (JavaBlackBelt)
ScjpMockTests(JavaRanch)