Explanation : GNU readline is a software library created and maintained by the GNU project. It provides line-editing capabilities. For instance, in a readline-enabled application, pressing C-b (CTRL-B) moves the cursor back one space, whereas C-f moves the cursor forward one space; C-r searches in history; these key bindings (which are the default, although bindings like vi's are optional) are taken from one of GNU's earliest and most popular projects, the text editor Emacs. Readline supports a variety of advanced features, including a kill ring (a more flexible version of a copy/paste clipboard) and tab completion. As a cross-platform library, readline allows many applications on various systems to exhibit identical line-editing behavior. It is a free package distributed under GNU General Public License (GPL).
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