История изменений

tail -f log.txt | awk '
BEGIN {        ### read stored IPs
  while(getline x < "ips.txt")
   a[x]=1
}
{ip="6.7.8.9"};  ### here you get IP from SRC:###.###.###.### field
 ! a[ip] {
      a[ip]=1
      print ip >> "ips.txt" ### store new IP
}'

tail log.txt  | awk '
BEGIN {        ### read stored IPs
  while(getline x < "ips.txt")
   a[x]=1
}
{ip="6.7.8.9"};  ### here you get IP from SRC:###.###.###.### field
 ! a[ip] {
      a[ip]=1
      print ip >> "ips.txt" ### store new IP
}'