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 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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