File (command)
file is a standard Unix program for recognizing the type of data contained in a computer file using magic numbers.
Read more about File (command): History, Specification, Usage, Other Implementations
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“Probably nothing in the experience of the rank and file of workers causes more bitterness and envy than the realization which comes sooner or later to many of them that they are “stuck” and can go no further.”
—Mary Barnett Gilson (1877–?)