#!/usr/bin/env python
     # encoding: utf-8
     #
     # Copyright (c) 2008 Doug Hellmann All rights reserved.
     #
     """
     """
     
     __version__ = "$Id$"
     #end_pymotw_header
     
     import cmd
     import os
     
     class ShellEnabled(cmd.Cmd):
         
         last_output = ''
     
         def do_shell(self, line):
             "Run a shell command"
             print "running shell command:", line
             output = os.popen(line).read()
             print output
             self.last_output = output
         
         def do_echo(self, line):
             "Print the input, replacing '$out' with the output of the last shell command"
             # Obviously not robust
             print line.replace('$out', self.last_output)
         
         def do_EOF(self, line):
             return True
         
     if __name__ == '__main__':
         ShellEnabled().cmdloop()