You can use
system_profiler to get this info.
% system_profiler SPPowerDataType | grep -i “current power source” -B10
You will get the current power source and the relevant details. For example, on my iMac, I get the following:
AC Power: System Sleep Timer (Minutes): 45 Disk Sleep Timer (Minutes): 10 Display Sleep Timer (Minutes): 10 Sleep on Power Button: Yes Automatic Restart on Power Loss: No Wake on LAN: Yes AutoPowerOff Delay: 259200 AutoPowerOff Enabled: 1 Current Power Source: Yes. <- This tells you this is the current power source DarkWakeBackgroundTasks: 0 Display Sleep Uses Dim: Yes Hibernate Mode: 0 High Standby Delay: 86400 PrioritizeNetworkReachabilityOverSleep: 0 Standby Battery Threshold: 50 Standby Delay: 86400 Standby Enabled: 1
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