Now script requires zsh

install_zsh.sh

@@ -1,10 +1,14 @@
 #!/bin/sh
 
-# Check if git installed
+# Check if necessary things are installed
 if ! command -v git &> /dev/null; then
     echo "This script requires git"
     exit 1
 fi
+if ! command -v zsh &> /dev/null; then
+    echo "This script requires zsh"
+    exit 1
+fi
 
 # Asking if user really want to install
 read -p 'This script will install oh my zsh and replace .zshrc with its own. If you still want to run it, type "y": ' -n 1 -r