I was supposed to modify the echo.c code of MINIX. I moved to the directory : /usr/src/commands/simple and created the echo.c file with vi editor.
I compiled it (cc) and then edited Makefile with vi editor. (Actually added echo where was needed)
Then i moved to usr/src and hit: make world to translate Minix' core and after hdboot to use the new one. But i'm still confused on how i'm supposed to run the new echo.
Any ideas?