/usr/bin/sml is in smlnj 110.76-1.
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
#!/bin/sh export SMLNJ_HOME=${SMLNJ_HOME:-/usr/lib/smlnj} exec $SMLNJ_HOME/bin/sml $@