PREUN

/bin/sh

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

POSTIN

/bin/sh

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