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7. Readline and Libedit Options

GNU bc can be compiled (via a configure option) to use the GNU readline input editor library or the BSD libedit library. This allows the user to do more editing of lines before sending them to bc. It also allows for a history of previous lines typed. When this option is selected, bc has one more special variable. This special variable, history is the number of lines of history retained. A value of -1 means that an unlimited number of history lines are retained. This is the default value. Setting the value of history to a positive number restricts the number of history lines to the number given. The value of 0 disables the history feature. For more information, read the user manuals for the GNU readline, history and BSD libedit libraries. One can not enable both readline and libedit at the same time.

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