file - determine type of files
$ file [options...] [files...]
file attempts to identify the type of files.
First, an attempt is made to identify a given file based on predetermined binary patterns. If this fails, file will fall back to determining the type based on the filename.
--help: Display this message-b, --brief: Do not prepend file names to output lines-I, --mime-type: Only show mime type.files: Files to identify# Identify a file
$ file Buggie.png
Buggie.png: PNG image data, 64 x 138
# Identify all files in the current directory, and show only the mime type.
$ file -I *