init.m—Wolfram Mathematica 9 Documentation

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Mathematica initialization files contain start-up code to be evaluated whenever a Mathematica kernel or front end is launched.
Possible locations for files include the following:

	$BaseDirectory/Kernel	kernel initialization code for all users
	$UserBaseDirectory/Kernel	kernel initialization code for the currently logged-in user
	$BaseDirectory/FrontEnd	front end initialization code for all users
	$UserBaseDirectory/FrontEnd	front end initialization code for the currently logged-in user

The user-specific initialization files within $UserBaseDirectory are read after the systemwide initialization files within $BaseDirectory, so any conflicting symbols will be defined as in the user-specific initialization files.
Mathematica will also load files from directories.
To suppress the loading of kernel initialization files, use the kernel command-line option -noinit.
To specify another file to be used for kernel initialization in addition to , use the kernel command-line option -initfile file, where file is the additional initialization file.
Template initialization files for the kernel are created automatically if they do not already exist.
If front end options are changed while Mathematica is running, the user-specific front end initialization file will be updated automatically to reflect these changes. The systemwide front end initialization file will remain unchanged.