Multi-line editing on Atom

Notice for windows users:

multiline cursor works using these keys in the following order :

CTRL + ALT +

and ↓, or ↑, or a mouse "Click" any where you need

1. Atom Commands

Select all text (Cmd+A on Mac, Ctrl+A elsewhere), then use the shortcut to “split the selection into lines” (Cmd+Shift+L on Mac, Ctrl+Shift+L elsewhere). Both commands are also available from the command palette.

PS: like many other keyboard shortcuts, these also work in Sublime Text

2. RegEx Search & Replace

Search for ^(.*)$ and replace with "$1",.