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file

Determine file type.

Give a description of the type of the specified file. Works fine for files with no file extension:

file {{filename}}

Look inside a zipped file and determine the file type(s) inside:

file -z {{foo.zip}}

Allow file to work with special or device files:

file -s {{filename}}

Don't stop at first file type match; keep going until the end of the file:

file -k {{filename}}