How to check bluetooth status via terminal

In addition to checking for the service you can use the command

hcitool dev

that will return all devices turned on.

Just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, You can run this command to see the status of bluetooth

sudo service bluetooth status

after you enter your password, you should see something like

bluetooth is running

More information with hciconfig -a

hciconfig -a provides way more information, including Bluetooth version.

$ hciconfig -a
hci0:   Type: Primary  Bus: USB
    BD Address: 00:1A:7D:DC:70:13  ACL MTU: 310:10  SCO MTU: 64:8
    UP RUNNING PSCAN 
    RX bytes:1013 acl:0 sco:0 events:60 errors:0
    TX bytes:4890 acl:0 sco:0 commands:60 errors:0
    Features: 0xff 0xff 0x8f 0xfe 0xdb 0xff 0x5b 0x87
    Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3 
    Link policy: RSWITCH HOLD SNIFF PARK 
    Link mode: SLAVE ACCEPT 
    Name: 'hostname'
    Class: 0x1c0104
    Service Classes: Rendering, Capturing, Object Transfer
    Device Class: Computer, Desktop workstation
    HCI Version: 4.0 (0x6)  Revision: 0x22bb
    LMP Version: 4.0 (0x6)  Subversion: 0x22bb
    Manufacturer: Cambridge Silicon Radio (10)