William Stein wrote:

> The justification for the existence of "./sage -sh" is that you can
> type "exit" to get out of that subshell, and all the Sage environment
> variables are no longer defined.  Also, on some systems "./sage -sh"
> changes the prompt as a reminder (it's a bug that it doesn't do this
> on all systems).
> 
+1

This is http://trac.sagemath.org/sage_trac/ticket/4644
I opened 6 month ago.

We have to thank Mike Hansen and Craig Citro for this :)

http://trac.sagemath.org/sage_trac/ticket/4512

Mike:
> Could we at least have a PS1 that includes the current directory? I always 
> hated it when I was on a machine where "sage -sh" didn't use my existing PS1.

Craig:
> Yeah, that would be very reasonable.

Jaap


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