\section prevd prevd - move backward through direcotry history

\subsection prevd-synopsis Synopsis
<tt>prevd [-l | --list] [pos]</tt>

\subsection prevd-description Description 

<tt>prevd</tt> moves backwards <tt>pos</tt> positions in the history
of visited directories; if the beginning of the history has been hit,
a warning is printed. If the <code>-l</code> or <code>--list</code>
flag is specified, the current history is also displayed.