dm-0.10.x_install.sh

#!/bin/sh
# install last version of dm, do, extlib...
sudo gem install do_mysql data_objects extlib
sudo gem install dm-core dm-aggregates dm-migrations dm-timestamps dm-types dm-validations dm-serializer dm-sweatshop dm-is-tree --no-ri --no-rdoc

dm-0.9.11_install.sh

#!/bin/sh
sudo gem install do_mysql data_objects extlib -v=0.9.12
sudo gem install dm-core dm-aggregates dm-migrations dm-timestamps dm-types dm-validations dm-serializer dm-sweatshop dm-is-tree -v=0.9.11 --no-ri --no-rdoc

dm_gems_cleanup.sh

#!/bin/sh
gem list '\A(?:(?:d[mo])[_-]|data_?(?:mapper|objects)|extlib)' --no-versions \
  | xargs sudo gem uninstall -aIx