/usr/share/sagemath/bin/sage-run-cython is in sagemath-common 8.1-7ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | #!/usr/bin/env python
import sys
from sage.repl.load import load_cython
from sage.misc.temporary_file import tmp_filename
if len(sys.argv) > 1:
s = load_cython(sys.argv.pop(1))
import sage.all
eval(compile(s, tmp_filename(), 'exec'))
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