/usr/share/gretl/scripts/ps9-6.inp is in gretl-common 2017d-3build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # PS9.6, for Example 9.7
open data9-1
ar1 demand 0 price income temp --hilu
ar1 demand 0 price income temp
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