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Jump between vim and shell

You have 2 options to working on shell without leaving vi:

1. ":sh" + "C-d": you don't know if you are in a "real" shell;

2. "C-z" + "fg": you can check if you've suspended a vim with "jobs", recommended;

Insert outside text into vim buffer

• from another file: ":r ";

• from external command: ":r !", for example:

:r !ls -l|grep abc

Ref: https://www.linux.com/learn/tutorials/442419-vim-tips-working-with-external-commands

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