Read output of command into your document
While editing a document, say you want to put the date somewhere. In Linux, you can issue the date command from the command line to see the date. From within VI, you can also issue the date, but have it input wherever your cursor is by issuing r!date.
Another example, would be to put a directory listing in a document. You can do that similarly by issuing r!ls -l.
Basically, enter r! followed by a command.
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