CLI - Ability to perform basic ls, cd, etc. to host

[ssomnath]

It would be nice if one could do basic file system operations (even listing and changing directories may be sufficient I guess) while inside the DataFed CLI. If it is already possible, it isn't very obvious to me. If it isn't already possible, I would suggest allowing an escape character to push all commands to the local file system. For example in ipython, one can simple add an exclamation mark before the standard shell command. E.g. - >> !ls