/usr/share/gretl/scripts/ps6-3.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 | # PS6.3, for Example 6.3
open data6-2
square effort
ols catch effort sq_effort
genr yhat1 = catch-$uhat
textplot yhat1 effort
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