Improve company productivity with a Business Account.Sign Up

x
?
Solved

converting decimal to hex in a ksh script

Posted on 1999-01-12
6
Medium Priority
?
815 Views
Last Modified: 2013-12-26
In a KSH script, I need to take an IP address and convert it to host long, which is a HEX format.
for example: 10.10.20.21 in hex is 168432661
Is there an easy wasy to do this?
Thanks in advance!
0
Comment
Question by:jwcorbett
6 Comments
 
LVL 51

Accepted Solution

by:
ahoffmann earned 200 total points
ID: 1295388
for the result in your question (which is decimal not hex):
    echo 10.10.20.21 | awk -F. '{printf "0x%x", ($1*256*256*256)+($2*256*256)+($3*256)+$4;}
or if you want hex:
    echo 10.10.20.21 | awk -F. '{printf "0x%x", ($1*256*256*256)+($2*256*256)+($3*256)+$4;}
0
 
LVL 51

Expert Comment

by:ahoffmann
ID: 1295389
first one should read:
   echo 10.10.20.21 | awk -F. '{print $1*256*256*256)+($2*256*256)+($3*256)+$4;}
sorry.
0
 

Author Comment

by:jwcorbett
ID: 1295390
Thank you!
It works, with a little change in syntax, but for an IP of 10.10.20.21, I get an answer 168433e+08
How can I format the naswer to give the whole number?

0
Get expert help—faster!

Need expert help—fast? Use the Help Bell for personalized assistance getting answers to your important questions.

 
LVL 85

Expert Comment

by:ozo
ID: 1295391
awk -F. '{printf "%d",($1*256*256*256)+($2*256*256)+($3*256)+$4;}'
 awk -F. '{printf "%08x",($1*256*256*256)+($2*256*256)+($3*256)+$4;}'
But this may fail for 128.10.20.21
perl -ne 'printf"%08x",unpack"N",pack"C*",split/\./'
0
 
LVL 51

Expert Comment

by:ahoffmann
ID: 1295392
echo 128.10.20.21 | awk -F. '{printf "%12.12d",($1*256*256*256)+($2*256*256)+($3*256)+$4;}'

works for me, but depending on your OS leading chars are blanks or zeros

0
 
LVL 3

Expert Comment

by:mliberi
ID: 1295393
You can do the whole job without using awk or perl:

#!/bin/ksh
IFSsave=$IFS
typeset -i a b c d     # declare fields to be integer
IFS='.'
echo 10.10.20.21 | read a b c d
IFS=$IFSsave

echo $(((a<<24)+(b<<16)+(c<<8)+d))
# if a>127 the result will be a negative number
exit



0

Featured Post

The 14th Annual Expert Award Winners

The results are in! Meet the top members of our 2017 Expert Awards. Congratulations to all who qualified!

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Here is how to use MFC's automatic Radio Button handling in your dialog boxes and forms.  Beginner programmers usually start with a OnClick handler for each radio button and that's just not the right way to go.  MFC has a very cool system for handli…
Introduction: Finishing the grid – keyboard support for arrow keys to manoeuvre, entering the numbers.  The PreTranslateMessage function is to be used to intercept and respond to keyboard events. Continuing from the fourth article about sudoku. …
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
From store locators to asset tracking and route optimization, learn how leading companies are using Google Maps APIs throughout the customer journey to increase checkout conversions, boost user engagement, and optimize order fulfillment. Powered …

595 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question