diff --git a/build.sh b/build.sh
index 56007cc..5ac5fe3 100755
--- a/build.sh
+++ b/build.sh
@@ -4,11 +4,19 @@ echo 'building all components'
 
 cd ..
 
+#building library first
+cd library/build
+cmake ..
+make 
+make test
+cd ../..
+
 for d in */; do
     cd "$d"
     FILE=build
-    if [ -f $FILE ]; then
-        echo 'building component ' + $d
+    echo $d
+    if [ -d $FILE ]; then
+        echo 'building component ' $d
         cd build
         cmake ..
         make
diff --git a/checkout-dev.sh b/checkout-dev.sh
new file mode 100644
index 0000000..901c2b7
--- /dev/null
+++ b/checkout-dev.sh
@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+cd ..
+
+for d in */; do
+    cd "$d"
+    FILE=build
+    if [ -d $FILE ]; then
+        git checkout dev
+    fi
+
+    cd ..
+done
+
+cd
+./build.sh
\ No newline at end of file
diff --git a/install.sh b/install.sh
index c41912a..a8b46c5 100755
--- a/install.sh
+++ b/install.sh
@@ -78,7 +78,7 @@ mkdir simple-draw/build
 git clone ssh://git@gitlab.repo.digitech.hs-emden-leer.de:2222/link/projekte/ws19/vkvm-new/demo.git
 mkdir demo/build
 
-cd Scripts
+cd installation
 
 echo "installation completed"
 ./build.sh
\ No newline at end of file
diff --git a/update.sh b/update.sh
index c63d817..a164227 100755
--- a/update.sh
+++ b/update.sh
@@ -7,8 +7,8 @@ cd ..
 for d in */; do
     cd "$d"
     FILE=build
-    if [ -f $FILE ]; then
-        echo 'updating componenent ' + $d
+    if [ -d $FILE ]; then
+        echo 'updating componenent ' $d
         git pull
     fi