sci@gentoo.org Gentoo Science Project Lmod is a lua based program to manage the user environment under Unix systems, specifically designed to easily handle the MODULEPATH Hierarchical problem. Environment Modules provide a convenient way to dynamically change the users' environment through modulefiles. This includes easily adding or removing directories to the PATH, LD_LIBRARY_PATH and other environment variables. enable auto swapping of compiler enable caching of modules allow duplicate entries in path TACC/Lmod