This bourne shell script calls the sg_turs utility on each given
DEVICE. This will send a SCSI TEST UNIT READY command to each
DEVICE. Disks, tape drives and DVD/BD players amongst others
may respond to this SCSI command.
Arguments to long options are mandatory for short options as well.
for each DEVICE given output a line containing either ' ready'
or ' device not ready'. If DEVICE is not found or there is
another serious error then an error message will appear instead.
print out the usage message then exit.
increase level or verbosity.
The exit status of this script is 0 when it is successful. Otherwise the
exit status is that of the last sg_turs utility called. See
the sg3_utils(8) man page.