Using ed on the "file" below (beginning with "stu_f_name Sam"),
g/stu_f//stu_f/,/stu_f/+1j joins the first and last names of the first two
"records" but not the last. Why doesn't it do the entire job?
stu_f_name Sam
Hazeltine
phone 939393
ssn 030303030
stu_f_name Joe
Waters
phone 93939
ssn 030303030
stu_f_name Joe
Waters
phone 93939
ssn 030303030