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These shell functions are the ones I find most useful. There are others among the Other Systems.
 

yorn

A generic yes/no asker that takes a question string. Returns true or false. Optionally returns a default.

ask

A generic question asker. Takes a question, an optional default answer, and, optionally, a list of valid replies. Returns the validated answer on stdout.

sel

A wrapper for the shell 'select' command. Takes the name of an array containing the options. Adds a leading 'Quit' option. Returns the string 'idx=<number>' to be 'eval'd to set the variable 'idx' to the index of the chosen element. returns the string 'exit' with a return code of 1 if 'Quit' is chosen. Displays a title if the variable 'title' is set. It is very easy to produce complex hierarchical menus with this.

celect

Works like 'sel', except that it returns strings that can be 'set -A' into an array.