title: how to execute c file in minix operating system
body: <p>Could someone explain to me what is  <code>a.out</code> and how it works?
  This is the first time I am using Unix (minix).
  I have one folder with two files <code>filename.c</code> and <code>test.sh</code> (containing three lines starting with ./a.out and some f=values).
  I just want to compile and execute <code>filename.c</code> if it is not?</p>