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Top Forums Shell Programming and Scripting Hostname lookup and create text file Post 302893574 by gubbu on Thursday 20th of March 2014 01:46:29 AM
Old 03-20-2014
Hostname lookup and create text file

I have a list of hostnames in a txt file . I need to do nslookup or other command on linux and get the ip address and if you dont find an ip address then put 0.0.0.0 instead in the output text file along with the hostname.

So input
Code:
host1
host2
host2.dd.ddd.net

Output
Code:
host1, 10.136.21.2
host2,10.127.1.2
host2.dd.ddd.net,0.0.0.0

thanks
G

Last edited by Scott; 03-20-2014 at 05:31 AM.. Reason: CODE tags instead of ICODE tags
 

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ap(8)							      System Manager's Manual							     ap(8)

NAME
ap - Parses addresses RFC 822-style SYNOPSIS
/usr/lib/mh/ap [-form file] [-format string] [-help] [-[no]normalize] [-width columns] addrs... OPTIONS
Overrides the default output format of ap. The output is formatted according to the instructions in the specified file. This must be a format file; see mh-format(4). Overrides the default output format of ap. The output is formatted according to the instructions in the specified string. This must be a format string; see mh-format(4). The argument to the -format option must be interpreted as a single token by the shell that invokes ap. Therefore, you should usually place the argument to this option inside double quotes ("). Prints a list of the valid options to this command. The -normalize option tells ap to try to find the official host name of the address. This is the default behavior, which can be suppressed using the -nonormalize option. Specifies the width of the screen in columns. DESCRIPTION
The ap program parses addresses according to the ARPA Internet standard. It also understands many nonstandard formats. It is useful for seeing how MH will interpret an address. The ap program treats each argument as one or more addresses, and prints those addresses in the official RFC 822 format. Hence, it is usu- ally best to enclose each argument in double quotes (") for the shell. In addition to the standard escapes, ap also recognizes the additional escape error, which is a diagnostic that is returned if the parsing operation failed. The default settings for the ap command are -normalize and -width columns, where columns is equal to the the width of the terminal. RESTRICTIONS
On systems where MH is configured with the BERK option, address parsing is not enabled. EXAMPLES
This is the default format string used by ap: %<{error}%{error}: %{text}%|%(proper{text})%> If an error was detected, the preceding string instructs ap to print the error, a colon (:), and the address that is in error. Otherwise, the ap command output is the proper RFC 822 format of the address. FILES
User profile. System customization file. SEE ALSO
Commands: dp(8) Files: mh-format(4) Standard for the Format of ARPA Internet Text Messages (RFC 822) ap(8)
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