feature: clear added to the shell

src/shell/exec.c

@@ -31,6 +31,8 @@ static CMD_TOK find_command(char *line)
 		command = HALT;
 	else if (!strcmp(line, "stack"))
 		command = STACK;
+	else if (!strcmp(line, "clear"))
+		command = CLEAR;
 	else if (!strcmp(line, "echo"))
 		command = ECHO;
 	else if (!strcmp(line, "color"))
@@ -100,6 +102,9 @@ void shell_init(void)
 		case STACK:
 			print_stack();
 			break;
+		case CLEAR:
+			terminal_clear();
+			break;
 		case ECHO:
 			kprintf(0, "echoing\n");
 			break;