file

Determine file type.

More information.

• 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}

• Determine the mime encoding type of a file:

file -i {filename}

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