# USE1.5 Software Environment HPC systems have generally installed multiple versions of several essential software tools and software environments. Package management tools provide access to this wide 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 * Conda ## Learning Outcomes * Query available software using the package manager and select the appropriate versions for deployment in the session environment. * Describe the MODULEPATH variable and understand shell variables relevant for executing and building software * Query information about packages using SPACK and install as well as load and unload software modules * Understand what conda environments are for and how a user can install their own environments ## Subskills * [[skill-tree:use:1:5:1:b]] * [[skill-tree:use:1:5:2:b]] * [[skill-tree:use:1:5:3:b]]