preinst is in ibus-doc 1.5.5-1ubuntu3.
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 | #!/bin/sh
set -e
case "$1" in
install|upgrade)
if [ -d /usr/share/gtk-doc/html/ibus ]; then
rm -rf /usr/share/gtk-doc/html/ibus >/dev/null || true
fi
;;
abort-upgrade)
;;
*)
echo "preinst called with unknown argument \`$1'" >&2
exit 1
;;
esac
|