diff --git a/malloc/tests/test-cmd.sh b/malloc/tests/test-cmd.sh
index e561d85..e633a4c 100755
--- a/malloc/tests/test-cmd.sh
+++ b/malloc/tests/test-cmd.sh
@@ -1,3 +1,24 @@
 #!/bi/sh
 
+RED='\033[0;31m'
+NC='\033[0m' # No color
+
 echo Hello world!
+
+check()
+{
+    if [ $? -ne 0 ]; then
+        echo $RED ERROR $NC
+    fi
+}
+LD_PRELOAD=./libmalloc.so ls 1> /dev/null
+check
+LD_PRELOAD=./libmalloc.so ip a 1> /dev/null
+check
+LD_PRELOAD=./libmalloc.so grep 1> /dev/null
+check
+LD_PRELOAD=./libmalloc.so find 1> /dev/null
+check
+LD_PRELOAD=./libmalloc.so tree 1> /dev/null
+check
+LD_PRELOAD=./libmalloc.so git status 1> /dev/null