Bash Script on a Mac creates a info popup

Is there a way in bash on a mac to draw a pretty info box that displays a simple message like "please save all files to /Users/......"

From stackoverflow Arcath

• You can run fragments of applescript from you bash scripts. A simple popup would look like this:

  #!/bin/bash
  /usr/bin/osascript <<-EOF
  
      tell application "System Events"
          activate
          display dialog "Hello world"
      end tell
  
  EOF
  

  This will feed the applescript between the EOF tags to osascript and execute it
  (resulting in a Hello World popup).

  From Shirkrin