POSTIN

/bin/sh

update-alternatives --install /usr/bin/vi uvi /usr/bin/vim-enhanced 20
update-alternatives --install /bin/vi  vi     /usr/bin/vim-enhanced 20
update-alternatives --install /bin/vim vim    /usr/bin/vim-enhanced 20
:

POSTUN

/bin/sh

[ $1 = 0 ] || exit 0
update-alternatives --remove uvi /usr/bin/vim-enhanced
update-alternatives --remove vi  /usr/bin/vim-enhanced
update-alternatives --remove vim /usr/bin/vim-enhanced
: