Update SAP kernel in UNIX based

I got a document for kernel update in UNIX based machine .Hereunder I pasted the steps ..In this am not able to understand step 4..Anybody please clarify it how can we compare the original kernel and the backup ..what is 840413 and 841992..Any mistake in the command.Please clarify the command of step4 for AIX .
1. Login as root
2. Make new backup directory
cd /
mkdir SIDkernel_10102007
3. Create latest kernel backup
cp -pr /sapmnt/SID/exe/* /SIDkernel_10102007
4. Compare the original kernel and the backup
du -sk /sapmnt/SID/exe/ --> 840413 /sapmnt/SID/exe
du -sk /SIDkernel_10102007 --> 841992 /SIDkernel_10102007
5. Make new shadow kernel directory
cd /
mkdir newkernel_175
6. Copy the new downloaded kernel files into /newkernel_175
7. Unpack the new downloaded kernel in folder /newkernel_175
SAPCAR -xvf SAPEXE_175-20000221.SAR
SAPCAR -xvf SAPEXEDB_175-20000223.SAR
8. Login as sidadm
9. Stop the SAP System
stopsap
10. Stop saposcol
saposcol -k
11. Login as root
12. Go to the current kernel directory
cd /sapmnt/SID/exe
13. Copy all extracted support packages into this folder
cp -pr /newkernel_175/* /sapmnt/SID/exe
14. Copy back the original file saproot.sh into this folder.
cp -p /SIDkernel_10102007/saproot.sh /sapmnt/SID/exe
15. Go to the current kernel directory
cd /sapmnt/SID/exe
Then run:
./saproot.sh SID
16. Login as sidadm
17. Start the saposcol service
saposcol
18. Start the SAP system
startsap
Thanks in advance

> 4. Compare the original kernel and the backup
> du -sk /sapmnt/SID/exe/ --> 840413 /sapmnt/SID/exe
> du -sk /SIDkernel_10102007 --> 841992 /SIDkernel_10102007
On Unix system you can get help for specific commands by using
man <commandname>
If you execute "man du" you will see, that "du" means "disk usage" and options "-s" and "-k" means "sum of directory" and "in kilobyte". The numbers are the sizes of the directories.
Markus

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ICU Version 2.6.1 Unicode Version 4.0
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hmmmmmmmm    i see
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kernel release                700
kernel make variant           700_REL
compiled on                   AIX 2 5 005DD9CD4C00
compiled for                  64 BIT
compilation mode              Non-Unicode
compile time                  May 13 2008 21:10:31
update level                  0
patch number                  160
source id                     0.160
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AIX 2 5
AIX 3 5
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