Add confirmation before deleting .bak file. Add message when installa…

…tion script ends.

install.sh

@@ -10,6 +10,29 @@ case $OSTYPE in
     ;;
 esac
 
+BACKUP_FILE=$CONFIG_FILE.bak
+
+if [ -e $HOME/$BACKUP_FILE ]; then
+  echo "Backup file already exist. Make sure to backup your .bashrc before running this installation." >&2
+     while true
+    do
+      read -p "Would you like to overwrite the existing backup? this will delete your existing backup file [Y/N] " RESP
+      case $RESP
+      in
+      [yY])
+          break
+        ;;
+      [nN])
+          echo "Installation have not started. Please come back soon!"
+          exit 1
+        ;;
+      *)
+        echo "Unknown choice. Please enter [Y/N] "
+        continue
+        ;;
+      esac
+    done
+fi
 test -w $HOME/$CONFIG_FILE &&
   cp -a $HOME/$CONFIG_FILE $HOME/$CONFIG_FILE.bak &&
   echo "Your original $CONFIG_FILE has been backed up to $CONFIG_FILE.bak"
@@ -112,4 +135,5 @@ else
       esac
     done
   done
+echo "Installation finished successfully! Enjoy bash-it!"
 fi