check package installed function bug fixed

scripts/sharedFuncs.sh

@@ -1,7 +1,8 @@
 
 function package_installed() {
-    local which=$(which $1 2>/dev/null)
-    if [ "$which" == "/usr/bin/$1" ];then
+    which $1 &> /dev/null
+    local pkginstalled="$?"
+    if [ "$pkginstalled" -eq 0 ];then
         show_message "package\033[1;36m $1\e[0m is installed..."
     else
         warning "package\033[1;33m $1\e[0m is not installed.\nplease make sure it's already installed"