Name	Description
FLUX_JOB_ID	the current jobid
FLUX_JOB_SIZE	the number of tasks in the current job
FLUX_JOB_NNODES	the total number of nodes hosting tasks on behalf of the job
FLUX_TASK_RANK	the global task rank (zero origin)
FLUX_TASK_LOCAL_ID	the local task rank (zero origin)
FLUX_JOB_TMPDIR	path to temporary, per-job directory, usually in /tmp
FLUX_URI	the URI of the enclosing Flux instance