EESSI command line interface

eessi is a lightweight command line tool to help with using the European Environment for Scientific Software Installaitons (EESSI).

• Website: https://eessi.io
• Documentation: https://eessi.io/docs
• GitHub: https:/github.com/EESSI

Installation

From PyPI

pip install eessi

From source

pip install .

Usage

Use eessi --help to get basic usage information.

check subcommand

Check CernVM-FS setup for accessing EESSI

(to be implemented)

init subcommand

Initialize shell environment for using EESSI

Use eval and eessi init to prepare your session environment for using EESSI.

eval "$(eessi init)"

To see which commands this would evaluate, just run eessi init.

shell subcommand

Create subshell in which EESSI is available and initialised

eessi shell --eessi-version 2025.06

You must specify the EESSI version to use, there is no default value for this.

Design goals

• Easy to install and use.
• User-friendly and intuitive interface to using EESSI.