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file    determine type of file
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$ file infile   #will give details of infile

The tool "file" runs three tests (1) filesystem tests (can the file be
printed or not), (2) magic test (the first few bytes will determine
the file type; apropos magic), (3) languge tests (ASCII, UTF-8, UTF-16 or 
other). If these tests fail then the file is "data".

-b brief
-F change separator from default of ":" 
-z uncompress the file before running tests