Latest Linux distributions install by default the bluez-utils package. Among all the useful tools included within the package, you can find these two:

• Hcitool: Remote Bluetooth devices discovery, name resolution, class identification.
  
  
  
  
• Sdptool: Service Discovery Protocol management, Bluetooth services discovery.
  
  
  
  Enumerating the services supported by certain remote device.
  
  
  
  
  Searching for remote devices that support Dial Up Networking Bluetooth service.
  
  
  
  
  Searching for remote devices that support OBEX FTP Bluetooth service.