Linux BlueTooth CLI

https://wiki.archlinux.org/title/Bluetooth

hciconfig

alex@latitude7490:~/ > hciconfig -a
hci0:   Type: Primary  Bus: USB
        BD Address: 10:3D:1C:AF:63:C3  ACL MTU: 1021:4  SCO MTU: 96:6
        UP RUNNING
        RX bytes:32033 acl:0 sco:0 events:3074 errors:0
        TX bytes:645909 acl:0 sco:0 commands:2766 errors:0
        Features: 0xbf 0xfe 0x0f 0xfe 0xdb 0xff 0x7b 0x87
        Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
        Link policy: RSWITCH SNIFF
        Link mode: SLAVE ACCEPT
        Name: 'latitude7490'
        Class: 0x1c010c
        Service Classes: Rendering, Capturing, Object Transfer
        Device Class: Computer, Laptop
        HCI Version:  (0xb)  Revision: 0x35af
        LMP Version:  (0xb)  Subversion: 0x35af
        Manufacturer: Intel Corp. (2)

Bluetooth version can be deduced from HCI version:

HCI version	Bluetooth version
0 (0x0)	1.0b
1 (0x1)	1.1
2 (0x2)	1.2
3 (0x3)	2.0
4 (0x4)	2.1
5 (0x5)	3.0
6 (0x6)	4.0
7 (0x7)	4.1
8 (0x8)	4.2
9 (0x9)	5.0
10 (0xa)	5.1
11 (0xb)	5.2
12 (0xc)	5.3
13 (0xd)	5.4

The above table is taken from Section 2.1 of BT Assigned Numbers Doc.

hciconfig has been deprecated. Use btmgmt and bluetoothctl instead, which are part of bluez stack.