files and directories - Where can I permanently modify Directory[]?

First I set

SetDirectory["F:\\learning_mma"];Directory[](*ok,success*)

and then I quite the kernel:

Quit[]

an then

Directory[]

it output the "C:\\Users\\Administrator\\Documents". So how can I modify Directory[] permanently?

Answer

You can run SetDirectory in the kernel initialization file, init.m. You'll find it here:

SystemOpen@FileNameJoin[{$UserBaseDirectory, "Kernel"}]