In the readline 7.0 info docs, I found the description of history_get()
a little unclear. It read to me at first like the OFFSET parameter was
an offset relative to history_base, so 0 up to history length or
something. If I'm not mistaken that's so of where_history(), set_pos()
etc, but history_get() is a full event number. Maybe something like,
assuming its correct :),
-- Function: HIST_ENTRY * history_get (int n)
Return the history entry at absolute event designator N. Entries
are from oldest at 'history_base' (*note History Variables::) to
newest at 'history_base + history_length - 1'. If N is outside
this range (or the history is empty) then return 'NULL'.
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