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Usage: squidclients [-o2bhHdi] < access.log > squidclients.{txt,html}
-o = omit browsers hostnames (to protect users' privacy)
-b = omit any client hostname (browser or server)
-2 = group by second level domain
-d # = number of domain name components to summarise by
-i # = number of domain name components to summarise by (include hostnames if components < x)
-H = html output
-h = help
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