Sponsored Content
Top Forums Shell Programming and Scripting Need a condition to account for failed nslookups Post 302599510 by jim mcnamara on Friday 17th of February 2012 10:19:23 AM
Old 02-17-2012
I would use the host command, the output is easier to parse. This is in ksh.

Code:
#!/bin/ksh    
# also works with /bin/bash
while read col1 col2 col3 col4
do
     ok=""
    for i in $col2 $col3 $col4
    do
          host $i >/dev/null
          if [ $? -eq 0 ] ; then
               ok=$i
               break          
          fi
    done
    if [ ! -z "$ok" ] ; then
         echo "we found a good one: $ok"
    else
         echo "no valid values found"
    fi
done < master_hosts

try that for a starter
 

9 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Setting an account to be a non-login account automatically?

Is there a way to easily change an account to be a non login account (NP in the shadow) file? I know I can just edit the file but that is not what we want to do. We use access control software and want to provide a way to set an account to be non-login using simple commands that can be mapped... (0 Replies)
Discussion started by: LordJezo
0 Replies

2. Shell Programming and Scripting

Bad day !! test condition failed --need a one liner to do --help

Hi all this is simple but bad day for me nothing work out .. Problem is that I wan to check the argument passed to my script and accordignly exit or setup ENV variable I have a script name src_cpcp_preproc.sh i want to pass 2 argumet from command line argumet and check it in the script... (13 Replies)
Discussion started by: jambesh
13 Replies

3. UNIX for Dummies Questions & Answers

Change Account to not lock account if password expires

I have access to 15+ UNIX boxes at work, and I do not consistently log onto all of them over time. When I do try to access one I havent been on in awhile, my account is locked as the password has expired. I need to request to the UNIX SA's that the password expiration is 90 days and that if it... (1 Reply)
Discussion started by: stringzz
1 Replies

4. Linux

Apply disk quota to account(dedicate 3 GB to account).

Hi , I am faceing lot of problem due to "disk space is not enough". senerio is like as, In system has 5 account. a,b,c,d,e say account c if very critical. Due to other user's data, user 'c' is faceing disk space issue. I want to dedicate 3 GB for user 'c'. No user... (1 Reply)
Discussion started by: ashokd009
1 Replies

5. UNIX for Dummies Questions & Answers

block user account after failed password

hi guys I have Centos 5.4 The idea is lock the user account for 3 minutes after he has entered his password incorrectly 3 times. I've modified /etc/pam.d/system-auth auth required pam_tally.so onerr=fail per_user deny=3 account required pam_tally.so resetbesides... (3 Replies)
Discussion started by: kopper
3 Replies

6. Solaris

multiple nslookups

Hi Guys i am creating a script in tcsh to perform a nslookup to a ip address. now i need to modify the script to perform nslookups on multiple ip addresses. the ip addresses are added as variables to the script on the command line. i also need to do a nslookup on a specific dns host. can... (10 Replies)
Discussion started by: brian112
10 Replies

7. How to Post in the The UNIX and Linux Forums

Simultaneously try to execute commands after connecting to remote account to one account

I have made password less connection to my remote account. and i tried to execute commands at a time. but i am unable to execute the commands. ssh $ACCOUNT_DETAILS@$HOST_DETAILS cd ~/JEE/*/logs/ (1 Reply)
Discussion started by: kishored005
1 Replies

8. Windows & DOS: Issues & Discussions

What happens to your skype account if you close outlook.com email account?

Hello, Does anyone know what happens to your skype account if you close the outlook.com email account which are linked together? As you know they are both owned by Microsoft. Thanks (0 Replies)
Discussion started by: milhan
0 Replies

9. Forum Support Area for Unregistered Users & Account Problems

Further to my query re: failed attempt to change email address on existing account

Neo Thanks for your reply to my original post, entitled "Problem changing the email address associated with my unix.com account". I am unable to reply to you in that thread, as I am unable to log-on to unix.com! From what you said about purging dormant accounts, it is likely that my account... (1 Reply)
Discussion started by: irb
1 Replies
echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.10 3 Aug 1994 echo(1B)
All times are GMT -4. The time now is 05:33 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy