This snippet of code pulls an array of hostnames from some log files. It has to parse around 3GB of log files, so I'm keen on making it as efficient as possible. Can you think of any way to optimize this to run faster?
HOSTS=()
for host in $(grep -h -o "[-\.0-9a-z][-\.0-9a-z]*.com" ${TMPDIR}/* |
sort | uniq); do
HOSTS+=("$host")
done
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