/usr/share/gretl/scripts/ps6-11.inp is in gretl-common 1.9.6-1build1.
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 | # PS6.11 for Example 6.8
open data6-4
logs WAGE
ols l_WAGE const EDUC EXPER AGE
genr ut = $uhat
square EDUC EXPER AGE
ols ut const EDUC EXPER AGE sq_EDUC sq_EXPER sq_AGE
genr LM = $nrsq
pvalue X 3 LM
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