Print unique ipaddresses as they come in from Apache Access Log File

tail -f /var/log/apache2/access.log | awk -W interactive '!x[$1]++ {print $1}'
Prints the unique IP Addresses as they arrive from an Apache `access.log` file. The '-W interactive' tells awk to start writing to stdout immediately and not buffer the output. This command builds on the uniq lines without sorting command (http://www.commandlinefu.com/commands/view/4389/remove-duplicate-entries-in-a-file-without-sorting.)

1
By: pykler
2010-01-12 15:23:03

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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