determine file type linux code example

Example 1: commandline print file type

file filename

Example 2: find file type linux script

#! /bin/sh
if [ -f "$1" ] && [ "`file -b --mime-type \"$1\"`" = "image/jpeg" ]; then
    echo "Good type for the file (JPEG)"
fi

Example 3: how to get file type in linux

file <filename>