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GNU Readline is a library implementing advanced command line editing
features for programs providing a REPL interface. When given the
--with-readline configuration option, the configure
script will search for GNU Readline or a compatible library and, if
found, the interface will be enabled. iklib readline for the
API documentation.
The home page of GNU Readline is at:
a compatible alternative is Editline:
and another possible replacement is Libedit: