prerm is in casacore-data-lines 0+git2016.11.26-2.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | #!/bin/sh
set -e
case "$1" in
remove|deconfigure)
if [ -L /var/lib/casacore/data/ephemerides/Lines ] ; then
rm -f /var/lib/casacore/data/ephemerides/Lines
rmdir -p --ignore-fail-on-non-empty /var/lib/casacore/data/ephemerides/
fi
;;
failed-upgrade|upgrade)
;;
*)
echo "prerm called with unknown argument \`$1'" >&2
exit 1
;;
esac
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