:~/pbe/chap8$ ./exer1.pl Use of uninitialized value $lname in pattern match (m//) at ./exer1.pl line 20, line 3. Use of uninitialized value $name in split at ./exer1.pl line 19, line 11. Use of uninitialized value $lname in pattern match (m//) at ./exer1.pl line 20, line 11. Use of uninitialized value $name in split at ./exer1.pl line 19, line 12. Use of uninitialized value $lname in pattern match (m//) at ./exer1.pl line 20, line 12. Use of uninitialized value $name in split at ./exer1.pl line 19, line 13. Use of uninitialized value $lname in pattern match (m//) at ./exer1.pl line 20, line 13. Use of uninitialized value $name in split at ./exer1.pl line 19, line 14. Use of uninitialized value $lname in pattern match (m//) at ./exer1.pl line 20, line 14. Use of uninitialized value $name in split at ./exer1.pl line 19, line 15. Use of uninitialized value $lname in pattern match (m//) at ./exer1.pl line 20, line 15.