diff --git a/.sources b/.sources
new file mode 100644
index 0000000..1a045a3
--- /dev/null
+++ b/.sources
@@ -0,0 +1,3 @@
+# Sources list
+debian=""
+openbsd="test"
diff --git a/shemum b/shemum
index 5d21bb5..a5c3a29 100755
--- a/shemum
+++ b/shemum
@@ -3,14 +3,12 @@
 # Author: Adrian Erik Hoemann
 # Date: 9.18.2024
 
-# TODO: Implement operating system installer variable list.
-
 # Debug mode
 # Default: true
 DEBUG=true
 
 # Debug mode check 
-if [$DEBUG -eq true]
+if [ $DEBUG ]; then
   set +x
 fi
 
@@ -24,58 +22,52 @@ ISO_PATH="$ROOT_PATH/$OS_NAME/$OS_NAME.iso"
 IMG_PATH="$ROOT_PATH/$OS_NAME/$OS_NAME.img"
 
 # Sources default values
-. ".env"
+#. ".env"
 
 # Sources virtual machine specific values
-. "$ROOT_PATH/$OS_NAME/.env"
+#. "$ROOT_PATH/$OS_NAME/.env"
 
 # Functions
 
 # Defines install image source
-function def_os_source() {
-  case $OS_NAME in
-    "openbsd")
-      INSTALL_IMG="https://cdn.openbsd.org/pub/OpenBSD/7.5/i386/cd75.iso"
-    ;;
-    "debian")
-      INSTALL_IMG=""
-    ;;
-    *)
-      error "INSTALL_IMG for $OS_NAME not found"
-    ;;
-  esac
+source() {
+  while read LINE; do
+    if [ $LINE == $OS_NAME* ]; then
+      $OS_NAME=$LINE
+    fi
+  done < .sources
 }
 
-function check() {
-  if [ -z $OS_NAME ]
-    error "Operating system is empty"
+check() {
+  if [ -z $OS_NAME ]; then
+    error "Operating system is not defined"
   fi
-  if [ -z $INSTALL_IMG ]
-    info "$INSTALL_IMG is not set"
+  if [ -z $INSTALL_IMG ]; then
+    info "$OS_NAME source not set, please update your .sources file"
   fi
 
 }
 
-function error() {
+error() {
   printf "$@" >&2
   exit 1
 }
 
-function warn() {
+warn() {
   printf "$@" >&2
 }
 
-function info() {
+info() {
   printf "$@" >&1
 }
 
 # Virtual machine removal
-function remove() {
+remove() {
   rm -r $ROOT_PATH/$OS_NAME 
 }
 
 # Virtual machine start without a console
-function start() {
+start() {
   qemu-system-x86_64 -boot c                            \
                        -display none                    \
                        -drive file=$IMG_PATH,format=raw \
@@ -83,7 +75,7 @@ function start() {
 }
 
 # Virtual machine start with a console
-function console() {
+console() {
   qemu-system-x86_64 -boot c                    \
                        -display curses            \
                        -drive file=$IMG_PATH,format=raw \
@@ -91,7 +83,7 @@ function console() {
 }
 
 # Virtual machine initialization with a console
-function init() {
+init() {
   def_os_source
   mkdir -p "$ROOT_PATH/$OS_NAME"
   qemu-img create $IMG_PATH $DISK_SIZE
@@ -111,7 +103,7 @@ function init() {
 }
 
 # Display usage
-function usage() {
+usage() {
   printf "Usage: shemum [init] <virtual machine name> <disk size>"
   printf " init        initialize a virtual machine"
   printf " start       start a QEMU virtual machine without console output"