Help Pages - Custom Commands

Custom Commands

Custom Commands tab in settings

Pre-launch command runs before the instance launches and post-exit command runs after it exits.

Both will be run in the launcher's working folder with extra environment variables:

  • $INST_NAME - Name of the instance
  • $INST_ID - ID of the instance (its folder name)
  • $INST_DIR - absolute path of the instance
  • $INST_MC_DIR - absolute path of Minecraft
  • $INST_JAVA - Java binary used for launch
  • $INST_JAVA_ARGS - command-line parameters used for launch (warning: will not work correctly if arguments contain spaces)

Wrapper command allows launching using an extra wrapper program (like 'optirun' on Linux)

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Last updated: April 18, 2026