idevice_id
可以用idevice_id列出当前（Mac中已）连接的（iOS）的设备ID=UDID
安装
brew install libimobiledevice
安装libimobiledevice后，根据GitHub官网介绍，其会包含很多工具：
| Utility | Description |
|---|---|
| idevice_id | List attached devices or print device name of given device |
| idevicebackup | Create or restore backup for devices (legacy) |
| idevicebackup2 | Create or restore backups for devices running iOS 4 or later |
| idevicecrashreport | Retrieve crash reports from a device |
| idevicedate | Display the current date or set it on a device |
| idevicedebug | Interact with the debugserver service of a device |
| idevicedebugserverproxy | Proxy a debugserver connection from a device for remote debugging |
| idevicediagnostics | Interact with the diagnostics interface of a device |
| ideviceenterrecovery | Make a device enter recovery mode |
| ideviceimagemounter | Mount disk images on the device |
| ideviceinfo | Show information about a connected device |
| idevicename | Display or set the device name |
| idevicenotificationproxy | Post or observe notifications on a device |
| idevicepair | Manage host pairings with devices and usbmuxd |
| ideviceprovision | Manage provisioning profiles on a device |
| idevicescreenshot | Gets a screenshot from the connected device |
| idevicesetlocation | Simulate location on device |
| idevicesyslog | Relay syslog of a connected device |
使用
举例：
> idevice_id -l
ed94089f3e34d5538065a695bfdf03dfbb3c5579
如果有多个设备，想要获取第一个，则可以借助head：
> idevice_id -l | head -n1
ed94089f3e34d5538065a695bfdf03dfbb3c5579
帮助和语法
~ idevice_id --help
Usage: idevice_id [OPTIONS] [UDID]
Prints device name or a list of attached devices.
If UDID is given, the name of the connected device with that UDID will be retrieved.
-l, --list list UDIDs of all devices attached via USB
-n, --network list UDIDs of all devices available via network
-d, --debug enable communication debugging
-h, --help prints usage information
Homepage: <http://libimobiledevice.org>