# 5. Manager Environment Variables¶

This page contains a centralized reference for the environment variables used by the manager.

## 5.1. FIRESIM_RUNFARM_PREFIX¶

This environment variable is used to prefix all Run Farm tags with some prefix. This is useful for separating run farms between multiple copies of FireSim.

This is set in sourceme-f1-manager.sh, so you can change it and commit it (e.g. if you’re maintaining a branch for special runs). It can be unset or set to the empty string.