/usr/lib/R/library/MASS/scripts/ is in r-cran-mass 7.3-29-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/R/library/MASS/scripts/ch01.R
/usr/lib/R/library/MASS/scripts/ch02.R
/usr/lib/R/library/MASS/scripts/ch03.R
/usr/lib/R/library/MASS/scripts/ch04.R
/usr/lib/R/library/MASS/scripts/ch05.R
/usr/lib/R/library/MASS/scripts/ch06.R
/usr/lib/R/library/MASS/scripts/ch07.R
/usr/lib/R/library/MASS/scripts/ch08.R
/usr/lib/R/library/MASS/scripts/ch09.R
/usr/lib/R/library/MASS/scripts/ch10.R
/usr/lib/R/library/MASS/scripts/ch11.R
/usr/lib/R/library/MASS/scripts/ch12.R
/usr/lib/R/library/MASS/scripts/ch13.R
/usr/lib/R/library/MASS/scripts/ch14.R
/usr/lib/R/library/MASS/scripts/ch15.R
/usr/lib/R/library/MASS/scripts/ch16.R