Here’s just a few ways to skin this cat:

# tac /etc/fstab | grep -m 1 fs144
10.239.11.144:/vol/vol22         /mnt/fs144/vol22        nfs     auto,rw,soft,mountvers=3 0 0

# grep fs144 /etc/fstab | tail -1
10.239.11.144:/vol/vol22         /mnt/fs144/vol22        nfs     auto,rw,soft,mountvers=3 0 0

# awk '{ if ( /fs144/ ) j=$0;} END {print j}' /etc/fstab
10.239.11.144:/vol/vol22         /mnt/fs144/vol22        nfs     auto,rw,soft,mountvers=3 0 0