Check the ip addresses accessing my server apache httpd server

cut -d' ' -f 1 access_log | sort -n | uniq

$ cut -d' ' -f 1 <access_log> | sort -n | uniq

Substitute the path of your apache access log, and it'll spit out a list of all IP addresses that have accessed your server.

Here's what that command is doing:

cut -d' ' -f 1 <access_log>

This will list out the first field of the access_log, using the space character as a delimiter. The output of this is then piped to:

sort -n

This, as you'd expect, does a numeric sort of the data received and then pipes the resulting list to:

uniq

Which eliminates duplicate entries on adjacent lines. Its output is displayed on-screen.\

http://serverfault.com/questions/267862/check-the-ip-addresses-accessing-my-server