Vim. Key mapping
shell | n0str0m0 | (2)
Maps are a way to create an association between a set of key strokes and a set of actions. They are really powerful. However, in this post, I will not explain them in the deepest detail. If you need further information, you will need a good Vim manual. As it happens with abbreviations, maps can be used regardless of the mode you are in Vim or they can be restricted to a certain operation mode. They work the same way in every mode. Type :help :map to know which map commands work in which mode.
First off,
:map
...
...
<Esc>OM <CR>
<Esc>Ol ...