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You could try this:

[mvngu@sage sage-4.5.3]$ echo $DOT_SAGE
/dev/shm/mvngu/dot_sage
[mvngu@sage sage-4.5.3]$ ./sage
----------------------------------------------------------------------
| Sage Version 4.5.3, Release Date: 2010-09-04                       |
| Type notebook() for the GUI, and license() for information.        |
----------------------------------------------------------------------
sage: os.path.isdir(os.getenv("DOT_SAGE"))
True