topher@nexus:~/foo$ ./student-HoH.pl List of all students: Registration Number: x1 Name: John Doe Registration Number: x2 Name: Jane Doe Registration Number: x3 Name: Bob Smith Registration Number: x4 Name: Mortimer Jones topher@nexus:~/foo$ ./student-HoH.pl x4 Information for student with registration number x4 is: Name: Mortimer Jones Age: 18 Phone: 555-0313 Marks: 77 Year: 2008