• 4.x era
  Modern version showing line numbers and selected text:
  
  
  
• 3.x era
  Modern version showing its undo support:
  
  
  
• 2.x era
  Modern version with a colorized interface:
  
  
  
• 1.x era
  Showing support for syntax highlighting:
  
  
  Switching between multiple file buffers with Meta-< and Meta->:
  
  
  
• before 1.0
  Default (basic) nano setup: