PREUN

/bin/sh

if [[ "$1" = "0" ]]; then
  perl -ni -e "/^DICT\s*vi\s*VI\s*vi_VI$/ or print" /usr/share/dict/ooo/dictionary.lst
fi

POSTIN

/bin/sh

if [[ ! -f "/usr/share/dict/ooo/dictionary.lst" ]] ||       ! grep -q "^DICT[ \t]*vi[ \t]*VI[ \t]*vi_VI" /usr/share/dict/ooo/dictionary.lst
then
  echo "DICT vi VI vi_VI" >> /usr/share/dict/ooo/dictionary.lst
fi