This extracts unique IP addresses from a logfile. You can use it for SEO or analytics.
[shell]cat log | cut -d’ ‘ -f1 | sort | uniq -u >unique_ips[/shell]
Here’s how it works:
cat— this prints the contents of a file
|— the pipe symbol sends the output of the previous command into the next command
cut -d' ' -f1— this cuts the file along a delimiter, which is a space (
-d=' ') and keeps only the first field (
-f1). In an Apache log, that is the IP address column.
sort— the output needs to be sorted before you can get the unique lines
uniq -u— this keeps only the unique lines
To learn more about the commands, type
man cat (or whatever command you want information on) in a terminal.
Tested on Ubuntu 11.10.