suite.rc

#!jinja2
[cylc]
    [[parameters]]
        world = eris, pluto, makemake, haumea
[scheduling]
    [[dependencies]]
        graph = hello<world>
[runtime]
    [[HELLO_FAMILY]]
        script = sleep 5; echo hello $WORLD
    [[hello<world>]]
        inherit = HELLO_FAMILY
        [[[environment]]]
            WORLD = $CYLC_TASK_PARAM_world