popd [ -q ] [ {+|-}n ]
       Remove an entry from the directory stack, and perform a cd to the
       new top directory.  With no argument, the current top entry is
       removed.  An argument of the form `+n' identifies a stack entry by
       counting from the left of the list shown by the dirs command,
       starting with zero.  An argument of the form -n counts from the
       right.  If the PUSHD_MINUS option is set, the meanings of `+' and
       `-' in this context are swapped.

       If the -q (quiet) option is specified, the hook function chpwd and
       the functions in the array $chpwd_functions are not called, and
       the new directory stack is not printed.  This is useful for calls
       to popd that do not change the environment seen by an interactive
       user.
