Wonders of Readline become painfully apparent when you have to use a program that doesn't employ it despite having a line-by-line command input interface. But!

Wonders of Readline become painfully apparent when you have to use a program that doesn't employ it despite having a line-by-line command input interface. But! By some stroke of luck and computer magic, Readline can be injected right into the program, at least in Unixes: there's an util called `with-readline` for that. Some programs have the editing features but lack command history for some reason, or don't store it between sessions―this is also solved by the addition of Readline.