/usr/share/gretl/scripts/misc/reprobit.inp is in gretl-common 2016a-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | open union_wooldridge.gdt
# list regressors (including time dummies)
list X = const black married educ dummify(year)
# default Gauss-Hermite quadrature
probit union X --random
# faster, but less accurate
probit union X --random --quadpoints=12
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