/usr/share/sagemath/bin/sage-eval is in sagemath-common 7.4-9.
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.all import *
from sage.calculus.predefined import x
from sage.repl.preparse import preparse
if len(sys.argv) > 1:
s = preparse(" ".join(sys.argv[1:]))
eval(compile(s,'<cmdline>','exec'))
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