/usr/share/sagemath/bin/sage-open 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 | #!/usr/bin/env bash
# SAGE open command for OS X -- needed since
# the SAGE libraries clash with some OS X libraries,
# will leads to a crash.
unset LIBRARY_PATH
open "$@"
|