file

Determine file type. More information: https://manned.org/file.

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

file path/to/file

• 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 path/to/file

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

file -k path/to/file

• Determine the MIME encoding type of a file:

file -i path/to/file