Hey folks. Long time lurker, first time poster. I'm a bit of a newbie at "coding" (obviously, scripting is a teensy bit different than coding) and I've run into a problem that I just can't seem to get around.

I'm going through a list of servers to check their name, IP, reverse-NSLOOKUP name and ping status (whether pinging the server was successful). The thing is, every time I try to run through a list of servers, I get hung up on servers that aren't found in the domain.

I want to catch those servers and make sure I know they're not in the domain, but I don't want it to lock up the program that's running.

Here's my code:

for node_name in `cat /var/opt/OV/share/utils/node_check/log/myname/check_these_servers.txt`
do
  #Check for full name and IP address
  nslookup $node_name > /tmp/nslookup.out
  if [ $? = 0 ]
  then
    full_name=`cat /tmp/nslookup.out | grep  "Name:" | awk {'print $2'}`
    ip_address=`cat /tmp/nslookup.out | grep  "Address:" | awk {'print $2'}`
  else
    full_name="NONE"
    ip_address="NONE"
    reverse_name="NONE"
    ping_status="NONE"
    echo $node_name,$full_name,$ip_address,$reverse_name,$ping_status >> /var/opt/OV/share/utils/node_check/log/myname/nnm_check.csv
    # The "continue" here will be put back in when the script is working
    # continue
  fi
  #Do a reverse NSLOOKUP on IP address for full name
  nslookup $ip_address > /tmp/nslookup.out
  if [ $? = 0 ]
  then
    reverse_name=`cat /tmp/nslookup.out | grep  "Name:" | awk {'print $2'}`
  else
    reverse_name="NONE"
  fi
  #Check for successful ping
  ping $full_name -n 5 > /dev/null
  if [ $? = 0 ]
  then
    ping_status="YES"
  else
    ping_status="NO"
  fi
  #Print results
  echo $node_name,$full_name,$ip_address,$reverse_name,$ping_status >> /var/opt/OV/share/utils/node_check/log/myname/nnm_check.csv
done

node_name1 node_name2 node_name3 node_name4 ...etc.

*** hostserver.domain-name.org can't find node_name3: Non-existent domain

node_name1,node_name1.domain-name.org,127.0.0.1 [I'm substituting a fake IP here for you guys],NODE_NAME1.domain-name.org,YES node_name2,node_name2.domain-name.org,127.0.0.2 [I'm substituting a fake IP here for you guys],NODE_NAME2.domain-name.org,YES

It's probably because this grep "Address:" | awk {'print $2'}` is matching 2 lines of output

Server:  dc.domain-name.org
Address:  127.0.0.10
Name:    node_name1.domain-name.org
Address:  127.0.0.22

ip_address=`awk '/Address:/{ I=$2} END{ print I}' /tmp/nslookup.out`

  [ -z "$full_name" ] && continue
  ping $full_name -n 5 > /dev/null

Thanks, Chubler_XL! That was what was causing the problem!

I ran the check as you suggested, just in case.

Cheers!