Write a command-line program to determine file type under Unix | Homework Helper

Write a command-line program to determine file type under Unix
When running your program with a file name as the input parameter, it should return the type of the file, such as ‘text file’, ‘executable file’, ‘C source code’, etc.
There are four possible ways to determine the type of a file:
Comparing the file extension to a list of known extensions;
By reading the first byte of the file and comparing it to a list of existing magic code;
Examining the return from a stat() system call;
For text files, read the contents of the file and try to figure it out;
For the purpose of this homework, you don’t have to implement all of the above four. Two will suffice. Any file that can’t be recognized should show ‘unknown type’.
Submit your source code and a test run result (either a ‘script’ file, or a screenshot).