I've created a directory in /tmp/csum-test on AIX 6.1. Then another under AIX 7.1 host called /tmp/csum-test. There is no files in the directories.
When I run csum -h SHA1 /tmp/csum-test on AIX 6.1 host it gives me a different value then if I run csum -h SHA1 /tmp/csum-test under the AIX 7.1 host. Granted the csum binaries are different however should csum have reported a different value and what is it including in it's comparisons for directories and files?
In simpler terms, what is this command comparing? I've searched around but couldn't find an answer that explicitly outlines the logic.
Hi, The csum command calculates a message digest for the specified files using the specified hash algorithm. Displays the checksum and byte count of a file.
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The reason it does not work on directories is because a very vital part of a directory entry is the first two bytes which is the inode number of an entry.
The first two entries of a directory are named . and ..
So, if either inode numbers are different csum and/or cksum will report generally report different values.
read: octalDump -decimalCharacter /some/directory
This will output two lines for each entry in the directory /some/directory
The first line: first number is the inode number; second line (ignore first two values (are inode number in character notation) - remaining bytes are the file/directory name) Example:
Hope this helps/explains WHY cksum/csum does not work on directories.
Hi,
I am getting read error when i run cksum </dir> but this command runs successfully for the files and in different server it runs for both files and directories. I am using in both the servers solaris 10 with patch 148888-03. Please suggest...
# cksum ravi(directory)
3454912345 0... (3 Replies)
I did this:
ls -lrRt | grep ^* | cksum *
but it is showing cksum of sub-directories.
Thanks You
Please use code tags when posting data and code samples, thank you. (3 Replies)
Hi all,
So I have a binary file and I need to generate an expected EEPROM checksum for it. Ideally, I would like to input the file (with the path) and output a computed checksum. Ive been using (cksum file1) with no avail and I was just curious as to whether there is such thing as EEPROM cksum,... (1 Reply)
Hi,
On what factors does the cksum depend.
If i build 2 machines exactly the same, then can i get the checksum of 2 compiled files same.
Thanks (3 Replies)
hi,
I am trying to use the cksum feature in unix. when i make a call to it i get returned something along the lines of:
4603435 14 file3
how do i get the first part of this response only; i.e:
4603435
I'm trying to use at a way without the use of sed and creating temp... (4 Replies)
Hi,
I have a working script, well it works on my machine but when I try it on others the cksum section does not work properly (I know the scripting is not of a high quality but I'm just trying to get it working)
Heres the script:
#!/bin/sh
case $# in
0) echo "usage: enshar filename... (7 Replies)
Hi there,
I have a query about cksum. I'm running a script on the Unix box and in a script the cksum result differs from when I run it manually. As far as I can see the file is not being changed, is there any other times that the cksum would be different. (4 Replies)
hello all.
I'm not asking about the algorithm - or how it goes about computing the checksum - I'm asking how it views/looks at the files it does the cksum on.
For instance:
Say you had a directory named "dir_A"
And within this directory you had some files.
So:
dir_A
- file1
-... (5 Replies)