tur

The tur program sends a TEST UNIT READY command to all SCSI devices attached to the system, or, if the optional -a b.t.l argument is specified, then the device at the specified ordinal SCSI address, where b is the logical SCSI bus, t is the SCSI target, and l is the SCSI lun on that target. The following example shows the format to use for the tur program:

tur [-a b.t.l]