diff --git a/install.sh b/install.sh
index 36c1fe8..23ea59c 100755
--- a/install.sh
+++ b/install.sh
@@ -1,21 +1,39 @@
 #!/bin/bash
 
-echo "Installing xcode commandline tools..."
-sudo xcode-select --install
-# Mojave fix
-sudo installer -pkg /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg -target /
+if [ ! -x "$(command -v git)" ]; then 
+  echo "Installing xcode commandline tools..."
+  sudo xcode-select --install
+  # Mojave fix
+  sudo installer -pkg /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg -target /
 
-echo "Installing homebrew..."
-/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
+  echo "Installing homebrew..."
+  /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
+else
+  echo "Homebrew already installed."
+fi 
 
-echo "Installing oh-my-zsh..."
-git clone https://github.com/robbyrussell/oh-my-zsh.git ~/.oh-my-zsh
-chsh -s /bin/sh
+if [ ! -d ~/.oh-my-zsh ]; then
+  echo "Installing oh-my-zsh..."
+  git clone https://github.com/robbyrussell/oh-my-zsh.git ~/.oh-my-zsh
+  chsh -s /bin/zsh
+else
+  echo "Oh-My-Zsh already installed."
+fi 
 
-echo "Installing homesick..."
-sudo gem install homesick
-homesick clone git@github.com:walkah/dotfiles.git
-homesick symlink -f
+if [ ! -d ~/.homesick ]; then
+  echo "Installing homesick..."
+  sudo gem install homesick
+  homesick clone git@github.com:walkah/dotfiles.git
+  homesick symlink -f
+else
+  echo "Homesick already installed."
+fi
+
+if [ ! -d ~/.asdf ]; then 
+  git clone https://github.com/asdf-vm/asdf.git ~/.asdf --branch v0.6.0
+else 
+  echo "asdf already installed."
+fi
 
 echo "Initial brew bundle..."
 brew bundle --global