how much power does your system need?
I wonder if my system is good or bad. My server needs 0.1kWh.
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Is there a (Linux) command I can run to check my power consumption?
Get a Kill-a-Watt meter.
Or smart sockets. I got multiple of them (ZigBee ones), they are precise enough for most uses.
If you have a laptop/something that runs off a battery, upower
upower
If you have a server with out-of-band/lights-out management such as iDRAC (Dell), iLO (HPe), IPMI (generic, Supermicro, and others) or equivalent, those can measure the server's power draw at both PSUs and total.