Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I am on the university machine trying to estimate the disk usage I have on my space I do

du -csh ./

from the begining of my account, but an error is given that ./Yesterday/Yesterday is not a device, so I do

du -csh --exclude="Yes*" ./

and the error is stopped. But is there a more elegant way, and why is this error emerging? I can image how the Yesterday of Yesterday gets removed but whats the concepts behind the error. Best,

1) using stat:

[ratz]s0128943: stat Yesterday 
File: `Yesterday' 
Size: 12288 Blocks: 24 IO Block: 4096 directory 
Device: 1dh/29d 
Inode: 714342402 
Links: 90 Access: (0745/drwxr--r-x) 
Uid: (35559/s0128943) 
Gid: (28065/ UNKNOWN) 
Access: 2010-10-15 13:06:07.000000000 +0100 
Modify: 2010-10-15 13:06:07.000000000 +0100 
Change: 2010-10-15 13:06:07.000000000 +0100

2) using stat on Yesterday/Yesterday

stat ./Yesterday/Yesterday 
stat: cannot stat `./Yesterday/Yesterday': No such device 

3) using uname for details

[ratz]s0128943: uname -srv 
Linux 2.6.18-194.3.1.el5.inf.1 #1 SMP Fri May 21 12:59:58 BST 2010 

4) using df on Yesterday/

[ratz]s0128943: df Yesterday/
Filesystem           1K-blocks      Used Available Use% Mounted on
AFS                    9000000         0   9000000   0% /afs

5) using df on Yesterday/Yesterday

df Yesterday/Yesterday 
df: `Yesterday/Yesterday': No such device

6) mount | grep Yesterday produces nothing

share|improve this question
could you give us more information about /Yesterday/Yesterday ? IS this a regular folder or a symlink? – echox Oct 15 '10 at 11:12
Looks like ./Yesterday is a snapshot of the whole home directory, which is usually a symlink. – Wei-Yin Oct 15 '10 at 11:33
Can you post the output of stat Yesterday and stat Yesterday/Yesterday? – Riccardo Murri Oct 15 '10 at 14:54
Also, what OS is this (output of uname -srv), and what (if anything) is mounted on Yesterday (output of df Yesterday/ Yesterday/Yesterday/ and mount | grep Yesterday)? – Gilles Oct 15 '10 at 17:53
I suspect that the fact that your home directory is on AFS is relevant. For your du problem, try du -x (du --one-file-system). I'm not sure if it will work though; otherwise I can't think of anything better than --exclude like you already did. – Gilles Oct 18 '10 at 14:30

Your university seems to be using an AFS filesystem and the Yesterday folder contains a read-only snapshot of yesterday's content in the Yesterday folder. Probably the web page of your university's IT department has some information on this.

Probably you have a quota set for your disk space (i.e. a maximum amount you are allowed to use), you can check your current usage with:

fs lq
share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.