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Re:macOS Big Sur by shangxiao on Thursday November 12, 2020 @03:54PM (#25074852)
"Professional use" just means to use in your profession, not that they are claiming to be an IT expert.
Re:macOS Big Sur by zepto on Thursday November 12, 2020 @07:38PM (#25077341)
In this case, it means they are typing Unix commands into a shell. That suggests that their profession involves IT.