Removing Blank Lines

Here's a handy one-liner to remove blank lines from a file.

:g/^$/d

Breaking this down. The "g" will execute a command on lines that match a regular expression. The regular expression matches blank lines, and the command is "d" (delete).

Vim.js

I'm not sure what utility this provides, but it's a pretty darn cool hack. Kudos to Lu Wang for this Javascript port of Vim. http://coolwanglu.github.io/vim.js/web/vim.html