mailing-list for TeXmacs Users

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  I am trying to use TeXmacs as a front end to Sage but some commands are not 
working as expected.
  First, I cannot change or list directory contents in a Sage session in 
TeXmacs.  'cd' and 'ls' give:
  Traceback (most recent call last):
  NameError: name 'cd' is not defined

  Second, I am having difficulty saving and loading sessions.  
'save_session('test')' gives:
  Traceback (most recent call last):
  AttributeError: 'str' object has no attribute 'keys'
Attempting to load a session I've saved from a Sage session outside of 
TeXmacs gives:
  Traceback (most recent call last):
  IOError: [Errno 2] No such file or directory: 'sage_session.sobj'
It always says 'sage_session.sobj' does not exist regardless of what filename 
I  specify in the load_session command.

  Any tips on how to use Sage from within TeXmacs are appreciated.  I am 
using TeXmacs 1.0.6.11 and Sage 2.10.1.