This is taken straight from here. Content is copied in case the link dies. I needed to redo the key bindings for Sublime after I upgraded the OS to 10.8. So here it is:
To get your Home and End keys working properly on Mac OS X (in my case, Mountain Lion, although this should work in prior versions back to at least Tiger), simply open the Terminal and do this:
$ cd ~/Library
$ mkdir KeyBindings
$ cd KeyBindings
$ nano DefaultKeyBinding.dict
Put these lines in that file, including the curly braces:
{
/* Remap Home / End keys to be correct */
"\UF729" = "moveToBeginningOfLine:"; /* Home */
"\UF72B" = "moveToEndOfLine:"; /* End */
"$\UF729" = "moveToBeginningOfLineAndModifySelection:"; /* Shift + Home */
"$\UF72B" = "moveToEndOfLineAndModifySelection:"; /* Shift + End */
"^\UF729" = "moveToBeginningOfDocument:"; /* Ctrl + Home */
"^\UF72B" = "moveToEndOfDocument:"; /* Ctrl + End */
"$^\UF729" = "moveToBeginningOfDocumentAndModifySelection:"; /* Shift + Ctrl + Home */
"$^\UF72B" = "moveToEndOfDocumentAndModifySelection:"; /* Shift + Ctrl + End */
}
Press Ctrl+O and then Enter to save the file, and Ctrl+X to exit. Restart your computer to have it take full effect.
