HPC systems have generally installed multiple versions of a number of key software tools and software environments. Package management tools provide access to this rich variety of software. A user has to load the software for the current shell session to make commands available.

The widely available software tools are:

• Environment modules
• Spack

• To utilize different package management tools to make software available

• Understand shell variables relevant for executing software and for building software
• Query available software using package manager
• Select the appropriate versions for deployment to the session environment

• USE1.4.1-B Overview
• USE1.4.2-B Environment Modules
• USE1.4.3-B Spack