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#!/usr/bin/env ruby

require 'ipaddr'
def dec2ip(dec) return IPAddr.new(dec, Socket::AF_INET).to_s end
def ip2dec(ip) return IPAddr.new(ip).to_i end
file=ARGV[0]
insertline=ARGV[1]...

I've cooked up a quick Perl script for this problem. Given a line that has an IP address, the script loops through the file, compares the IP addresses and plugs the input line wherever appropriate.
...

vi '+/192\.189\.1\.2' log_file << EOF
o$fwInsert^[:wq
EOF



where the ^[ is the ESC character, entered by typing CONTROL-V ESCAPE in vi insert mode.

Also. It may be tricky to add the...