title: GCC C compiler (gcc -Wall -o foo.c foo.c )
body: <p>When I type to my terminal:</p>
  
  <pre><code>gcc -Wall -o foo.c foo.c
  </code></pre>
  
  <p>After that <code>foo.c</code> is deleted. There is no reason to type this but does anybody know why this happens?</p>