Finding IPs in a logfile…two approaches.

In bash:
cat /path/to/file | awk '{print $1}' | sort | uniq -c | sort -n

In perl:
perl -ane '$c{$F[0]}++; END {print map {$_ . "\t->\t" . $c{$_} . "\n"} (sort {$c{$b} $c{$a}} keys %c)[0..9]}' /path/to/file

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