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FreeBSD csh / tcsh: Export Shell Variable

Q. I'm using FreeBSD 7 with csh (tcsh) shell. How do I export shell variable under FreeBSD operating systems?
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FreeBSD Display Environment Settings

Q. How do I display shell environment settings under FreeBSD operating systems?
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How do I add a new path to $PATH variable under Linux and UNIX like operating system? What is my path, and how do I set or modify it using csh/tcsh or bash/ksh/sh shell?
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I just need a help to show me how to setup java path on Linux. How can I set JAVA_HOME and PATH variables for every user under my Linux system?
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