Shell Script Question

keenboy · 10-21-2009, 10:36 AM

I am new to shell scripting and am getting stuck into some documentation to help.

I am looking at writing a short script which will give me a directory sizes of a systems home directories and pipe the results into a text file.

I can issue the following command to get the readings I want for each users home directory

Code:

du -sh /home/user

What I'd like to do would be to create a variable/array which I can run the command against.

I have tried to create an array built on the result of

Code:

ls /home

to see if that would work but it hasn't done what I wanted. Would anybody be able to point me in the right direction so I can get cracking?

Many thanks,

vikas027 · 10-21-2009, 11:00 AM

You can try this command

Code:

> /tmp/size
for i in `ls -lrth /home | grep ^d | awk '{print $9}' | grep -v lost+found`;do du -sh $i >> /tmp/size; done;

This will create a file /tmp/size, containing the needed info like.

Code:

   4K   eagle
  19M   vikas
 836M   browser
   1G   mi

I request the moderators to move this thread to programming section.

catkin · 10-21-2009, 11:19 AM

Quote:

Originally Posted by vikas027

I request the moderators to move this thread to programming section.

The "Report" button is a neat way to contact the moderators.

keenboy · 10-22-2009, 03:23 AM

Thanks for your reply, really appreciated.

I have run the command you posted in a script but it creates an empty /tmp/size file.

I've tried breaking the command up to see where the problem might be.

If I run

Code:

ls -lrth /home | grep ^d | awk '{print $9}'

from the command line, I don't get any output just a few empty lines from where I ran the command to where the new command line is.

Would this be where the problem is?

Many Thanks for your help.

vikas027 · 10-22-2009, 03:44 AM

Quote:

Originally Posted by keenboy

Thanks for your reply, really appreciated.

I have run the command you posted in a script but it creates an empty /tmp/size file.

I've tried breaking the command up to see where the problem might be.

If I run

Code:

ls -lrth /home | grep ^d | awk '{print $9}'

from the command line, I don't get any output just a few empty lines from where I ran the command to where the new command line is.

Would this be where the problem is?

Many Thanks for your help.

If you are not getting any output, that means there are no directories (or home directories of users) in /home.

Could you please post output of

Code:

ls -lrth /home
and
useradd -D

keenboy · 10-22-2009, 06:07 AM

Here is the output from those commands, thanks.

Code:

ls -lrth /home

drwxr-xr-x   4 demo2         users    4.0K 2006-06-12 12:25 demo2
drwxr-xr-x   4 demo          users    4.0K 2006-06-12 14:27 demo
drwxr-xr-x   3 stadmin       users    4.0K 2008-03-31 12:39 stadmin
drwxr-xr-x   3 lidias        users    4.0K 2008-11-07 16:26 lidias
drwxrwxr-x  22 alex          users    8.0K 2009-09-23 10:37 alex

Code:

useradd -D

GROUP=100
HOME=/home
INACTIVE=-1
EXPIRE=
SHELL=
SKEL=/etc/skel

ghostdog74 · 10-22-2009, 07:18 AM

Quote:

Originally Posted by vikas027

You can try this command

Code:

> /tmp/size
for i in `ls -lrth /home | grep ^d | awk '{print $9}' | grep -v lost+found`;do du -sh $i >> /tmp/size; done;

you are going a round about way to finding directories in the /home path. Also, if directory names have spaces, your awk command with $9 won't work. an easier way is to use find, just an example

Code:

$ find /home -type d -print0 | xargs -0 du -sh

vikas027 · 10-22-2009, 08:33 AM

Quote:

Originally Posted by ghostdog74

you are going a round about way to finding directories in the /home path. Also, if directory names have spaces, your awk command with $9 won't work. an easier way is to use find, just an example

Code:

$ find /home -type d -print0 | xargs -0 du -sh

Thanks, ghostdog. But I checked it on my system, this commands includes sub-directories too. This command is also printing space of all subdirectories

However, the OP just wants the size of the home directories of users.

vikas027 · 10-22-2009, 08:40 AM

Oops, my mistake. I forgot to write /home in the script after du -sh (to make it path independent).

Now, try.

Code:

> /tmp/size
for i in `ls -lrth /home | grep ^d | awk '{print $9}' | grep -v lost+found`;do du -sh /home/$i >> /tmp/size; done;

There might not be the optimal way but this is as per my competence.

ghostdog74 · 10-22-2009, 09:07 AM

Quote:

Originally Posted by vikas027

Thanks, ghostdog. But I checked it on my system, this commands includes sub-directories too. This command is also printing space of all subdirectories

However, the OP just wants the size of the home directories of users.

depth of recursive can be fixed with -prune or -maxdepth (GNU find). you have misunderstood what i mean by directory names with spaces

Code:

# ls -1
dir with space
t1
t2
test.txt
test with space.xml
test.xml

#  find . -type d -print0 | xargs -0 du -sh
40K     .
8.0K    ./t1
8.0K    ./t2
8.0K    ./dir with space

the command correctly shows directory with spaces and its size.

whereas your for loop:

Code:

$ for i in `ls -lrth  | grep ^d | awk '{print $9}'`; do echo "$i"; done
with

vikas027 · 10-22-2009, 10:08 AM

Quote:

Originally Posted by ghostdog74

Code:

$ for i in `ls -lrth  | grep ^d | awk '{print $9}'`; do echo "$i"; done
with

Thanks, I got the message.