One of the major features of the Korn shell is the ability to manipulate current and previous commands using the built-in editors and the fc command.
If you make a mistake on the current command line, instead of having to backspace to fix it, or killing the entire line and starting over, you can use the in-line editor to make the correction much more quickly and efficiently.
If you want to re-execute a command, instead of having to type it in all over again, you can use the command re-entry feature to call it back up. You can even make changes to it before re-executing!
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