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(python2.1-tut.info)History Substitution

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History Substitution
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History substitution works as follows.  All non-empty input lines
issued are saved in a history buffer, and when a new prompt is given
you are positioned on a new line at the bottom of this buffer.  <C-P>
moves one line up (back) in the history buffer, <C-N> moves one down.
Any line in the history buffer can be edited; an asterisk appears in
front of the prompt to mark a line as modified.  Pressing the <Return>
key passes the current line to the interpreter.  <C-R> starts an
incremental reverse search; <C-S> starts a forward search.