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### @fork decorator not recognized in script

I'm trying to run a test script with the @fork decorator, but it isn't being recognized. The script looks like this:

#!/home/raltman/sage-5.10/sage

@fork
def f(a):
return a;

out=f("hi");
print out;


When I run this, I get the following error message:

Traceback (most recent call last):
File "/home/raltman/test.sage", line 3, in <module>

@fork

NameError: name 'fork' is not defined

The same code works when I run it in the sage console, and the script itself works without the @fork decorator. I'd really appreciate any help on this!