After you complete this topic, you should be able to:

• Use the Apptainer command-line interface
• Run a container using apptainer run, apptainer exec, and apptainer shell
• Execute commands that run inside an Apptainer container
• Name the host directories that are mounted inside a container by default
• Limit access to host directories from a container using the -C, --no-home, and --no-mount options
• Bind addtional host directories to containers using the --bind option
• Configure environment variables for shells that run in the container
• Start, list, and stop containers running in the background

This topic covers basic information on containers and Apptainer usage through the command line interface. Some familiarity with Linux is preferred, but it is not necessary.