title: pushd/popd on ksh?
body: <p>Is there an equivalent of the bash pushd/popd build in commands for the KSH?</p>
  
  <p>For those who don't know what pushd and popd in bash do, here is the description from the man page</p>
  
  <pre><code>   pushd [-n] [dir]
     pushd [-n] [+n] [-n]
            Adds  a directory to the top of the directory stack, or rotates
            the stack, making the new top of the stack the current  working
            directory.   With  no arguments, exchanges the top two directo-
            ries and returns 0, unless the directory stack is empty.
  
  
     popd [-n] [+n] [-n]
            Removes entries from the directory stack.  With  no  arguments,
            removes  the top directory from the stack, and performs a cd to
            the new top directory.  Arguments, if supplied, have  the  fol-
            lowing meanings:
  </code></pre>
  
  <p>Thanks </p>