cool for vi users

Enable vi ksh command line editing - Tech-Recipes.com: "To enable vi editing, type the following command or place it in your .kshrc file:

set -o vi

Then you can use vi commands. Press escape to enter vi command mode then you have access to many vi commands. For example, k will move up through previous commands in the history, /tail will search for the most recent command containing the word tail and pressing n will find the next occurence of that search term.

Once you have found a command that you want to repeat, just press ENTER and it will be run again. You can edit the command with R to replace characters from your current position, x to delete the current character, i to insert characters before the current character, a append characters after the current character, and $ to move to the end of the command."