One of the main causes of the fall of the Roman Empire was that, lacking zero, they had no way to indicate successful termination of their C programs.
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Nice post, Peter.
Just a couple of remarks:
In your Examples 1 and 2, for completeness and to be precise, you could mention that the user should hit the Enter key at the end, to actually execute the modified commands.
And likewise, in Example 3, that they should hit and then Enter, to exit the temporary file brought up by vi for the v command, and that the command gets executed immediately (IIRC) when they type that key sequence - you don't get a chance to edit it more, as I recall.
Other than those two minor nits, useful article, and it's cool that you dug through the source to find info for it ...
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