Bash script to compare multiple variables

[nexusroot]

Basically im going to have a variable with a list of IP address'. I need a very simple script to compare and tell me if any of those IP address' are the same. Generally the list will be less then 5 IP's but it could be more, and i just need to know if theres duplicates. I haven't been able to come up with a good clean way to work this one out. if anyone has any suggestions that would be great!

an example of my test.ip file:

user1     tty01        Jan 16 03:16
user2     ttyp0        Jan 16 19:19 10.10.69.22
user3     ttyp1        Jan 16 20:31 10.10.69.241
user4     ttyp1        Jan 16 20:31 10.10.69.22

heres the portion of the script im trying to work with :

count="0"
ttyp_ip=`cat test.ip |awk '/ttyp/{print $6}'`
for each in ${ttyp_ip}
do
  echo "ttyp ip = ${each}"
  count=`expr ${count} + "1"`
  echo "new count = ${count}"
  eval  ttyp_ip_${!count}="${each}"
  echo "unique ip variable is ttyp_ip_${count} which = $ttyp_ip_${!count}"
done
#somehow compare all ttyp_ip_counts here...

EDIT:

ehh i guess i figured out how to do it this way :

count="0"
rand=$RANDOM

ttyp_ip=`cat test.ip |awk '/ttyp/{print $6}'`
for each in ${ttyp_ip}
do
#  echo "ttyp ip = ${each}"
  count=`expr ${count} + "1"`
#  echo "new count = ${count}"
  eval  ttyp_ip_${!count}="${each}"
#  echo "unique ip variable is ttyp_ip_${count} which = $ttyp_ip_${!count}"
  prune_ip=`echo $ttyp_ip_${!count} |tr -d '.'`
  if [ -e /tmp/$prune_ip.$rand ]
  then
    echo "FAILURE - MULTIPLE LOGINS FROM SAME IP $each"
  else
   touch /tmp/$prune_ip.$rand
  fi
done

rm /tmp/*.$rand

Not sure if theres a better way or not, if there is let me know!

[nmset]

ttyp_ip=`cat test.ip |awk '/ttyp/{print $6}'`
for each in ${ttyp_ip}
do
  nb=$(grep -c $each test.ip)
 [ $nb -gt 1 ] && echo "$each has $nb occurences."
done

Unless I have misunderstood your requirements, this script shows you IPs that have more than one occurence in test.ip.

[nexusroot]

Ah there was a better way. I like that way, the only thing i don't like about it is if it see's the IP address 3 times it's going to echo a failure message 3 times. My way only does once. Considering this is going to be ran across 500 systems trying to display the least amount of junk as possible is key.

i guess i could do something like this:

  nb=$(grep -c $each test.ip)
  [ $nb -gt 1 -a ! -e /tmp/$each ] && echo "FAILURE - MULTIPLE LOGINS FROM SAME IP $each"
  touch /tmp/$each

thanks for the suggestions!