Minor program improvements

src/kernel/shell.c

@@ -21,7 +21,7 @@ void shell_install()
     }
     else if (strcmp(input_buffer, "help") == 0)
     {
-        printf("This is the Blank Operating System\ndesigned for fun by xamidev\n\nCommand help:\n\n\thelp - shows this message\n\tpanic - makes the kernel panic\n\twords - generates random words\n\tprimes - computes prime numbers\n");
+        printf("help\tpanic\twords\tprimes\trainbow\tclear\n");
     }
     else if (strcmp(input_buffer, "panic") == 0)
     {
@@ -35,6 +35,14 @@ void shell_install()
     {
 	    program_primes();
     }
+    else if (strcmp(input_buffer, "rainbow") == 0)
+    {
+	program_rainbow();
+    }
+    else if (strcmp(input_buffer, "clear") == 0)
+    {
+	program_clear();
+    }
     else {
 	printf("Unknown command %s\n", input_buffer);
     }