#!/bin/bash
s="user|396012_232|program|30720Mn|
|396012_232.batch|batch|30720Mn|5108656K
user|398498_2|program|102400Mn|
|398498_2.batch|batch|102400Mn|36426336K
user|391983_233|program|30720Mn|
|391983_233.batch|batch|30720Mn|5050424K"
awk 'BEGIN{OFS=FS="|"} NR%2==1 { prev=$0 }; NR%2==0 { print prev $5 }' <<< "$s"
IyEvYmluL2Jhc2gKcz0idXNlcnwzOTYwMTJfMjMyfHByb2dyYW18MzA3MjBNbnwKfDM5NjAxMl8yMzIuYmF0Y2h8YmF0Y2h8MzA3MjBNbnw1MTA4NjU2Swp1c2VyfDM5ODQ5OF8yfHByb2dyYW18MTAyNDAwTW58CnwzOTg0OThfMi5iYXRjaHxiYXRjaHwxMDI0MDBNbnwzNjQyNjMzNksKdXNlcnwzOTE5ODNfMjMzfHByb2dyYW18MzA3MjBNbnwKfDM5MTk4M18yMzMuYmF0Y2h8YmF0Y2h8MzA3MjBNbnw1MDUwNDI0SyIKYXdrICdCRUdJTntPRlM9RlM9InwifSBOUiUyPT0xIHsgcHJldj0kMCB9OyBOUiUyPT0wIHsgcHJpbnQgcHJldiAkNSB9JyA8PDwgIiRzIg==