code: func (s *Action) Copy(ctx context.Context, c *cli.Context) error {
  	force := c.Bool("force")
  
  	if len(c.Args()) != 2 {
  		return ExitError(ctx, ExitUsage, nil, "Usage: %s cp <FROM> <TO>", s.Name)
  	}
  
  	from := c.Args()[0]
  	to := c.Args()[1]
  
  	return s.copy(ctx, from, to, force)
  }
docs: // Copy the contents of a file to another one