I've had this problem a few times; the partition where my "/var/log" directory lives is filling up fast, what application (= sub directory) is eating up all the disk space?

Just guessing the OP has a similar task. It could be home directories, database partitions, whatever.

Hi Rolf, We are looking for the amount of disk space used by a directory on a mounted filesystem, for example if a filesystem is allocation for 8gb space and on that file system if I have directory call ABC consuming 4gb space, which means 50% of the space consumed by the directory ABC on that filesystem, can we get this sort information?

Like this ( i remember this has been mentioned already):

somehost:~ # mount | grep mysql
/dev/sda3 on /var/lib/mysql type ext3 (rw,acl,user_xattr)
somehost:~ # df -h /var/lib/mysql/
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda3             215G   75G  129G  37% /var/lib/mysql
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Or a variation of it.

I read this: 37% (75G of 215G) of /var/lib/mysql are used".

Or i didn't understand the problem, who knows.

Karl

«The Crux of the Biscuit is the Apostrophe»

As I already pointed out, the "du" tool can help you with this by reporting directory sizes but you will have to calculate percentages yourself.

Here's an example that does pretty much what you describe, go ahead and hammer it into the shape you want:

#!/usr/bin/perl

use strict;
use warnings;

my $dir = join(' ', map { '"'.$_.'"' } @ARGV) || "*"; # Use arguments 
+or default to pwd
my @lines = qx(du -sc $dir);    # Get sizes in bytes, with total
my ($total) = split(/\s/, pop @lines);  # Get total number of bytes
foreach my $line (@lines) {
  if ($line =~ /(\d+)/) {
    printf("%6.2f%%\t%s", $1 * 100 / $total, $line); # Prefix %
  } 
}
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-- FloydATC

Time flies when you don't know what you're doing