This is assuming your webserver log is access.log.
Extract unique IP addresses from the webserver log:
cat access.log | awk '{print $1}' | uniq
Count number of unique IP addresses from log:
cat access.log | awk '{print $1}' | uniq | wc -l
List the IP addresses of users using iPhones:
cat access.log | grep -i iphone | awk '{print $1}' | uniq | sort
Count number of IP addresses of visitors who have a 444 error:
grep '444 0' access.log | awk '{print $1}' | sort -n | uniq -c | sort -n
List and sort user-agent strings uniquely:
awk -F"\"" '{print $6}' access.log | sort | uniq -dc | sort -nr
List top 25 IP addresses that have accessed my website:
awk '{print $1}' access.log | sort -n | uniq -c | sort -n | tail -25
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