That means you’re supposed to pass an argument to the script with the model? number of the device. So since your device is an 8937, run the script like so: ./fastboot.sh 8937
Further down the script, you can see what it actually does: it unlocks the device, flashes a bunch of partitions and finally reboots it. Since you didn’t specify the model number, it skipped the flashing bit and went directly to the reboot bit. :)
Edit: I also took a look at the .bat files, they basically do they same thing except under Windows, and it’s specific to the model.