VERSION shell command

config/.conf

@@ -1,11 +1,13 @@
 # CONFIG #
 
+OS_VERSION = "\"dev\""
+
 BUILD_DIR ?= $(abspath build/)
 
 TARGET = i686-elf
 TARGET_ASM = nasm
 TARGET_ASMFLAGS =
-TARGET_CFLAGS = -std=c99 -g
+TARGET_CFLAGS = -std=c99 -g -DOS_VERSION=$(OS_VERSION)
 TARGET_CC = $(TARGET)-gcc
 TARGET_CXX = $(TARGET)-g++
 TARGET_LD = $(TARGET)-gcc

src/kernel/shell.c

@@ -3,11 +3,20 @@
 #include "lib/string.h"
 
 int shell_run(char *cmd){
+    int ret = 0;
+
+    puts("\x1b[32m");
     if(!strcmp(cmd, "HELLO")){
         printf("Hello!\n");
     }
+    else if(!strcmp(cmd, "VERSION")){
+        printf("%s\n", OS_VERSION);
+    }
     else{
         printf("SHELL: Unknown command \"%s\"\n", cmd);
-        return 127;
+        ret = 127;
     }
+    puts("\x1b[0m");
+    
+    return ret;
 }