/usr/share/doc/tin/examples/expiretover is in tin 1:2.4.1-1build2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | #! /bin/sh
# expire old local cached tin overviews
# purge all files which weren't accessed in the last numdays days
numdays=28
overviewbase=${TIN_INDEX_NEWSDIR-"${TIN_HOMEDIR-"$HOME"}/.tin"}
if test -d $overviewbase ; then
( find $overviewbase/.news* -type f -name "[0-9]*.[0-9]" \
-atime +$numdays |\
xargs rm -f ) && exit 0
fi
exit 1
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