postinst is in casacore-data-tai-utc 1.2.
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 | #!/bin/sh
set -e
case "$1" in
    triggered|configure)
        casacore-update-tai_utc
	;;
    abort-upgrade|abort-remove|abort-deconfigure)
	;;
    *)
        echo "postinst called with unknown argument \`$1'" >&2
        exit 1
	;;
esac
 |