[awk] print comma-separated NUS emails

email.sh

#!/bin/awk

# a1234567b@nus is not a valid address, but a1234567@nus is. Hence this
# script.

# Expects: lines of nus matric no, like a1234567[...]
# Outputs: comma-separated nus email addresses on a single line, like
#          [email protected],[...]

{ printf "%[email protected],", substr($0,0,8) }