Mac OS X home and end keys do not function the same way as they do on other systems.
On Mac, the Home and End keys go to the top and bottom of a document, instead of to the beginning or end of a line.
Check out this Lifehacker article which shows how to remap the functionality of the home and end keys to make them perform like they do on other systems.
The default shortcuts for moving to beginning or end of (wrapped) lines are ⌘← and ⌘→. ⌥↑ and ⌥↓ or ⌃A and ⌃E move to the beginning or end of unwrapped lines (or paragraphs). ⌥← and ⌥→ move backwards/forward by words, and all of these are compatible with holding Shift to select during the corresponding moves.
You could remap home and end by creating ~/Library/KeyBindings/ and saving a property list like this as DefaultKeyBinding.dict:
{
"\UF729" = moveToBeginningOfLine:; // home
"\UF72B" = moveToEndOfLine:; // end
"$\UF729" = moveToBeginningOfLineAndModifySelection:; // shift-home
"$\UF72B" = moveToEndOfLineAndModifySelection:; // shift-end
}
Most of the keybindings for editing text in OS X are defined in /System/Library/Frameworks/AppKit.framework/Resources/StandardKeyBinding.dict.
Applying changes requires reopening applications. DefaultKeyBinding.dict is ignored by some old versions of Xcode (works with latest version 6.3.1), Terminal, and many cross-platform applications.
See Cocoa Text System and my website for more information about the customizable keybindings.
Terminal's keybindings can be customized in Preferences > Settings > Keyboard. \033OH moves to the beginning of a line and \033OF to the end of a line.
In Eclipse, key bindings should be modified in Preferences > General > Keys. You need to modify default bindings for commands Line Start and Line End (replace ⌘← by ↖ and ⌘→ by ↘). For selection to work, also modify Select Line Start and Select Line End.
PS: You may need to logout and login again for the ~/Library/KeyBindings/DefaultKeyBinding.dict change to take effect.
Best Answer
You can do this with Karabiner's 'Use PC Style Home/End #2'.
This remaps Home and End to ⌘← and ⌘→ respectively.