Re: Why is there difference between sum sizes of individual files and output by du?

Prasad wrote:
Hi All,

This is what I have noticed. When I manually add the sizes of
individual files in a directory the sum is different than what is
produced by du on the same directory.

( /home/Prasad/programs/c/lsp/IPC/message_queue/ contains no
directories within)
[Prasad@prasadjoshi my_du]$ ls -al
/home/Prasad/programs/c/lsp/IPC/message_queue/
total 32
drwxrwxr-x 2 Prasad Prasad 4096 Jan 1 18:59 .
drwxrwxr-x 4 Prasad Prasad 4096 Jan 8 18:47 ..
-rw-rw-r-- 1 Prasad Prasad 971 Jan 1 18:59 first_receiver.c
-rw-rw-r-- 1 Prasad Prasad 1505 Jan 1 18:58 first_sender.c
-rwxrwxr-x 1 Prasad Prasad 5642 Jan 1 15:09 rcv
-rwxrwxr-x 1 Prasad Prasad 6115 Jan 1 15:09 send

971 + 1505 + 5642 + 6115 = 14233
14233 / 1024 = 13

[Prasad@prasadjoshi my_du]$ du
/home/Prasad/programs/c/lsp/IPC/message_queue
28 /home/Prasad/programs/c/lsp/IPC/message_queue

Why is there so much of difference?

Educated guess: your version of du prints in units of 512 bytes rather than in units of 1024 bytes, as the standard du would do.

--
Josef Möllers (Pinguinpfleger bei FSC)
If failure had no penalty success would not be a prize
-- T. Pratchett

.

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