Textmate used to allow selecting multiple lines and doing ⌥ + ⌘ + A to add text to the end of each line.
This no longer seems to work in Textmate 2.
Any ideas if this feature still works?
The answer was found at Textmate 2 Tips.
Alternatively to steps 1 and 2, you can make the original selection by holding down the option key (⌥) while making the selection with the mouse.