system_profiler

Report system hardware and software configuration. More information: https://ss64.com/osx/system_profiler.html.

Display a report with specific details level (mini [no personal information], basic or full):

system_profiler -detailLevel {{level}}

Display a full system profiler report which can be opened by System Profiler.app:

system_profiler -xml > MyReport.spx

Display a hardware overview (Model, CPU, Memory, Serial, etc) and software data (System, Kernel, Name, Uptime, etc):

system_profiler SPHardwareDataType SPSoftwareDataType

Print the system serial number:

system_profiler SPHardwareDataType|grep "Serial Number (system)" | awk '{ print $4 }'