Vim command to insert blank line in normal mode

Question

Is there any command in Vim that will do the same thing as o or O (insert a blank line before/after the current one), but which doesn\'t also switc

Answer 1

In insert mode:

:normal O

From vim inline manual:

Execute Normal mode commands {commands}. This makes it possible to execute Normal mode commands typed on the command-line. {commands} are executed like they are typed. For undo all commands are undone together. Execution stops when an error is encountered. If the [!] is given, mappings will not be used. {commands} should be a complete command. If {commands} does not finish a command, the last one will be aborted as if or was typed.

http://vimdoc.sourceforge.net/htmldoc/various.html#:normal

I got the hint there: https://unix.stackexchange.com/a/16452/7914