How to read file, and replace certain string with another string? Post: 302927709

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Top Forums Shell Programming and Scripting How to read file, and replace certain string with another string? Post 302927709 by RavinderSingh13 on Thursday 4th of December 2014 11:57:38 PM

12-05-2014

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Quote:

Originally Posted by type8code0

Hi all, the value in the following file is just an example. It could be a different value/network addresses.
Here is my example of initial output in a file name net.txt
Initial Output, net.txt

The goal is to produce the following format which is to convert from CIDR to Netmask formatting.
My current draft script which is not perfect is to use “sed” to replace “/24” with “255.255.255.0” format. This is part of network subnetting conversion.

This is to print the initial net.txt value and save the final output to net-mask.txt
or
Or course the sed script for CIDR to netmask table above is not complete. The full list of the conversion can be found here. Netmask / CIDR Translation Table

Please let me know where is the best place to put “sed” into my shell script file.
If there is better way to do this, please let me know. Thanks in advance.

Hello type8code0,

Following may help you in same.

Code:

 awk -F"/" '{sub("8","255.0.0.0",$2);sub("16","255.255.0.0",$2);sub("24","255.255.255.0",$2);print}' Input_file

Output will be as follows.

Code:

10.0.0.0 255.0.0.0
172.16.1.0 255.255.0.0
192.168.1.0 255.255.255.0

EDIT: Also kindly use code tags for commands and codes not quotes, quotes you can use to address any user's speicific post etc purposes like I have used above for your post, you can go through the forum rules in below link.

https://www.unix.com/misc.php?do=cfrules

Thanks,
R. Singh

Last edited by RavinderSingh13; 12-05-2014 at 01:00 AM.. Reason: Added suggestion to use code tags in place of quotes for user

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