G-Cows allows to execute commands and scripts written in any programming language; they are executed with the privileges of the user running Cows. If you work on files created by others, you may allow them to do everything (this is not a Cows peculiarity: executing a program created by someone else is potentially dangerous). Before running Cows on scripts created by other users, make sure to read Section 23.5.
This manual can be downloaded from http://www.g-cows.org/.