TFTR_SHOT and TFTR_SHOT_NO are logical names that contain the current shot number .
TFTR_SHOT is usually set when the ``early'' waveforms arrive from CICADA, about 2 minutes after the start of the shot. It is not set for test shots (shot numbers greater than 99000). It is defined on all the primary cluster nodes and most workstations. TFTR_SHOT_NO is set by the CICADA-VAX transfer process and is is updated when the SOS (Start of Sequence) event occurs on the TFTR shot clock. To see both values do:
$ SHOW LOGICAL TFTR_SHOT*