open INF, "<$file" or  print "\n\tmy message\n" ; 
                         "\n\tActual error :: $!\n"  ;
                         return 0 ;

##</code><code>##

open INF, "<$file" or do{ print "\n\tmy message\n",
                         "\n\tActual error :: $!\n"  ;
                         return 0 ;
}

##</code><code>##

  open INF, "<$file" or (print("\n\tmy message\n", "\n\tActual error :: $!\n"), return 0)