/usr/lib/R/site-library/getopt/INDEX is in r-cran-getopt 1.20.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | get_Rscript_filename Returns file name of calling Rscript
getopt C-like getopt behavior
sort_list Recursively sorts a list
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