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Clear all variables but not functions

• To: mathgroup at smc.vnet.net
• Subject: [mg122181] Clear all variables but not functions
• From: "mailcwc at gmail.com" <mailcwc at gmail.com>
• Date: Wed, 19 Oct 2011 05:34:45 -0400 (EDT)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com

I define some functions in the init.m that starts with Mathematica.
How do I clear all variables but not these functions in the init.m?

I am also confused about the differences among Remove, Clear,
ClearAll, and Quit.
Are there some cases that one function is preferred than others.