UNIX for Advanced & Expert Users

Hi ,

i'm using special binary file (lotus notes) and modifying an hexadecimal address range with windows hex editor and it works fine !

The file is an AIX one and i'm forced to transfert (ftp) it before modifying it and re-transfert !

NOW i would do this directly under AIX !

I can display the file with "od -h -Ax" and i wonder how to modify the all range in red with a shell script ?

od -h file.nsf
...........................................
0000140 0000 0025 2ff1 cb40 0000 0000 3204 0000
0000150 da03 0000 ca02 0000 4601 0000 1201 0000
0000160 4201 0000 0000 0000 2e02 0000 0000 0000
0000170 0000 0000 0000 0000 0000 0000 0000 0000
0000180 0000 0000 0000 0000 3e01 0000 0000 0000
0000190 0000 0000 3a01 0000 1e01 0000 0000 0000
00001a0 1a01 0000 0000 0000 0000 0000 0601 0000
00001b0 0000 000

the purpose here , is to write "0" over all values of the range !

Something like : "cat file.nsf|.................|od -h -Ax"

thanks in advance

Christian

emacs can edit binary data. See this page. And adb can edit binary data, but it is stretching the tool a little bit.

Thanks for your answer !

The reason i posted is :

1 i can'y install tool on the AIX , i'm not the root admin

2 i need an easy way to change the file for unix novice , simple users , so a script is the solution !

the range value is always the same , maybe an AWK can scan this range and do the change but i'm not AWK expert !

regards
Christian

My od barfs on "od -h". I am not sure AIX can run this script. But it might give you an idea on how to do it on AIX. I took a core file as my file to be edited. And I build a 60 byte patch file. I made it all "FF" since my core file had a bunch of zeros in that range. Then I dump the interesting section of the core file, install the patch, and then dump the core file file a second time. It works for me.

Code:

#! /usr/bin/ksh

print -n aaaaaaaaaa > temp
print -n aaaaaaaaaa >> temp
print -n aaaaaaaaaa >> temp
print -n aaaaaaaaaa >> temp
print -n aaaaaaaaaa >> temp
print -n aaaaaaaaaa >> temp
tr "a" "\177" < temp > patch
od -v -A x -t x2 patch

echo
od -v -A x -t x2 < core | sed '1,20d;30q'

dd if=patch bs=1 conv=notrunc of=core seek=364 count=60

echo
od -v -A x -t x2 < core | sed '1,20d;30q'
exit 0

It works !!!!!!!!!

THANK YOU VERY VERY VERY VERY MUCH !!!!!!!!!!!!!


christian