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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