# Software Environment Environment Modules ([Lmod](http://www.admin-magazine.com/HPC/Articles/Lmod-6.0-Exploring-the-Latest-Edition-of-the-Powerful-Environment-Module-System)) are used to configure your environment for many pieces of installed software on greenplanet, including compilers and MPI environments. To see a list of available packages, type: "ml spider" ```bash ml spider ``` To load a specific package/version, type: `ml modulename/versionnumber`. The 2020.1 release of the Intel Compilers is: Type: "ml intel/2020.1" ```bash ml intel/2020.1 ``` To see which modules are currently loaded: Type: "ml" ```bash ml ``` If you wish to make your settings default for all login sessions and jobs, place your ml commands in ~/.bashrc. If you want to use them just in a specific job, add them to the job script. Some pieces of software may be installed to /sopt on the cluster (shared opt) and not be configured in modules. Other packages that were modules previously may now be provided by the OS. Note: it is highly recommended to a have `ml purge` at the beginning of the job execution portion of your slurm submission script. This clears out any accidental environments picked up from your login shell.