cat << EOF | awk '/User-Agent/{brow=$NF} END{sub(/\\r.*$/, "", brow); print brow;}'
Internet Protocol Version 4, Src: 192.168.0.29 (192.168.0.29), Dst: www.l.google.com (64.233.187.104)
Time to live: 128
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0\r\n
EOF
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