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Shell Programming and Scripting

Read Hostname and Return IP Address

 
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Old 11-15-2008
Read Hostname and Return IP Address
Dear Experts,

I have a text file on my itanium box which contains list of nearly 1000 hostnames. I do not have the IP Address of them. I want read each entry from the text file and want to do a nslookup to the DNS Server and get the IP Adresses and put them in another file in the format hostname IP Address.

Lets say,

I have abcd.server.com in my text file first line. I want a script which reads this entry and gets the IP Address from DNS and paste in another file as

abcd.server.com 1.1.1.1

the script should then read the next entry in the text file and go until the end of the file and exit.


Thanks in Advance
 
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LEARN ABOUT CENTOS

radtest

RADTEST(1)							 FreeRADIUS Daemon							RADTEST(1)

NAME

       radtest - send packets to a RADIUS server, show reply

SYNOPSIS

       radtest [-d raddb_directory] [-t pap/chap/mschap] [-x ] [-4 ] [-6 ] user password radius-server nas-port-number secret [ppphint] [nasname]

DESCRIPTION

       radtest	is  a  frontend to radclient(1). It generates a list of attribute/value pairs based on the command line arguments, and feeds these
       into radclient. It's a fast and convenient way to test a radius server.

OPTIONS

       -d raddb_directory
	      The directory that contains the RADIUS dictionary files. Defaults to /etc/raddb.

       -t pap/chap/mschap/eap-md5
	      Choose the authentiction method to use.  e.g. "-t pap", "-t chap", "-t mschap", or "-t eap-md5",.  Defaults to "pap".  Using EAP-MD5
	      requires that the "radeapclient" program is installed.

       -x     Enables debugging output for the RADIUS client.

       -4     Use NAS-IP-Address for the NAS address (default)

       -6     Use NAS-IPv6-Address for the NAS address (default)

       user   Username to send.

       password
	      Password of the user.

       radius-server
	      Hostname or IP address of the radius server. Optionally, you may specify a port by appending :port

       nas-port-number
	      The  value  of  the NAS-Port attribute. Is an integer between 0 and 2^31, and it really doesn't matter what you put here. 10 will do
	      fine.

       secret The shared secret for this client.

       ppphint
	      If you put an integer > 0 here, radtest (or actually radclient) will add the attribute Framed-Protocol = PPP to the request packet.

       nasname
	      If present, this will be resolved to an IP address and added to the request packet as the NAS-IP-Address	attribute.  If	you  don't
	      specify it, the local hostname of the system will be used.

SEE ALSO

       radiusd(8), radclient(1).

AUTHOR

       Miquel van Smoorenburg, miquels@cistron.nl.

								   5 April 2010 							RADTEST(1)