How can I put cursor on every line in Sublime Text?

On a mac, you can highlight the lines you wish to edit and use CMDShiftL, or ctrlShiftL on Windows.

On Mac

1. cmd+A (Select all)
2. cmd+shift+L (Split selection into lines)
3. shift+2 (Surround selection with quotes)
4. esc (Escape)

Four steps:

1. Select all the text: CTRL A
2. Activate multi-cursors: CTRL (or CMD on Mac) SHIFT L
3. Press the Home key to move all cursors to the front of the line
4. Press the " quote key to insert the quote.

Using the Home End and CTRL + left | right arrow keys is handy when managing multiple cursors.