Rose is a framework for managing and running control suites (in our case, specifically JULES control suites / cylc workflows).
For general information on Rose and Cylc as used in the UK's UM/Momentum system, see here. Official Rose tutorials are at Rose tutorials
STEP 0: Check whether Rose is already installed.
rose --version
If Rose has already been installed on your system, this will give you a version number (a date); otherwise it'll say "command not found".