postrm is in anthy 9100h-25ubuntu1.
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 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | #! /bin/sh
set -e
case "$1" in
       purge|remove|upgrade|failed-upgrade|abort-install|abort-upgrade|disappear)
        if [ "$1" = purge -a -e /usr/share/debconf/confmodule ]; then
            . /usr/share/debconf/confmodule
            db_purge
            rm -rf /var/lib/anthy \
                   /var/cache/anthy \
                   /etc/anthy/diclist \
                   /etc/anthy/dict.args
            if [ ! -f /etc/anthy/* ]; then
              rmdir /etc/anthy
            fi
        fi
        ;;
    *)
        echo "postrm called with unknown argument \`$1'" >&2
        exit 1
esac
# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.
# Automatically added by dh_installdebconf
if [ "$1" = purge ] && [ -e /usr/share/debconf/confmodule ]; then
	. /usr/share/debconf/confmodule
	db_purge
fi
# End automatically added section
exit 0
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