diff --git a/run.sh b/run.sh
old mode 100644
new mode 100755
index 2f22b10a..36fb4929
--- a/run.sh
+++ b/run.sh
@@ -1,58 +1,55 @@
-#!/bin/bash
+#!/bin/sh
 #
 # About: Build OpenDiablo 2 automatically
 # Author: liberodark
 # License: GNU GPLv3
+set -eu
 
-version="0.0.1"
+version="0.0.2"
 
 echo "OpenDiablo 2 Build Script $version"
 
-
 #=================================================
 # RETRIEVE ARGUMENTS FROM THE MANIFEST AND VAR
 #=================================================
 
-distribution=$(cat /etc/*release | grep "PRETTY_NAME" | sed 's/PRETTY_NAME=//g' | sed 's/["]//g' | awk '{print $1}')
+distro=$(sed -n 's#PRETTY_NAME="\([^"]*\)"#\1#p' /etc/os-release)
 
-compile_od2(){
-	  echo "Build OpenDiablo 2"
-      go get
-	  go build
-	  chmod +x OpenDiablo2
-	  echo "Build finished. Please edit config.json before running OpenDiablo2"
-      }
+# Check OS & go
 
-go_run(){
-echo "Install Go for OpenDiablo 2 ($distribution)"
+if ! command -v go >/dev/null
+then
+	echo "Install Go for OpenDiablo 2 ($distro)? y/n"
+	read -r choice
+	[ "$choice" != y ] && [ "$choice" != Y ] && exit
 
-  # Check OS & go
-
-  if ! command -v go &> /dev/null; then
-
-    if [[ "$distribution" = CentOS || "$distribution" = CentOS || "$distribution" = Red\ Hat || "$distribution" = Suse || "$distribution" = Oracle ]]; then
-      sudo yum install -y go &> /dev/null
-
-      compile_od2 || exit
-      
-    elif [[ "$distribution" = Fedora ]]; then
-      sudo dnf install -y go &> /dev/null
-    
-      compile_od2 || exit
-    
-    elif [[ "$distribution" = Debian || "$distribution" = Ubuntu || "$distribution" = Deepin ]]; then
-      sudo apt-get update &> /dev/null
-      sudo apt-get install -y go --force-yes &> /dev/null
-    
-      compile_od2 || exit
-      
-    elif [[ "$distribution" = Manjaro || "$distribution" = Arch\ Linux ]]; then
-      sudo pacman -S go --noconfirm &> /dev/null
-    
-      compile_od2 || exit
-
-    fi
+	case "$(echo "$distro" | tr '[:upper:]' '[:lower:]')" in
+		centos|red\ hat|suse|oracle)
+			sudo yum install -y go >/dev/null 2>&1
+			;;
+		fedora)
+			sudo dnf install -y go >/dev/null 2>&1
+			;;
+		debian|ubuntu|deepin)
+			sudo apt-get update >/dev/null 2>&1
+			sudo apt-get install -y go --force-yes >/dev/null 2>&1
+			;;
+		manjaro|arch\ linux)
+			sudo pacman -S go --noconfirm >/dev/null 2>&1
+			;;
+		gentoo/linux)
+			sudo emerge --ask n go /dev/null 2>&1
+			;;
+		*)
+			echo "$distro: unsupported distribution, please install Go by yourself"
+			exit 1
+			;;
+	esac
 fi
-}
 
-go_run
+# Build
+echo "Build OpenDiablo 2"
+go get
+go build
+chmod u+x OpenDiablo2
+echo "Build finished. Please edit config.json before running OpenDiablo2"