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Full Discussion: df vs du for directory sizes
Top Forums UNIX for Advanced & Expert Users df vs du for directory sizes Post 302538909 by kalak on Thursday 14th of July 2011 01:16:43 PM
Old 07-14-2011
du reports usage for the files in directories, while df reports on the filesystem itself. Filesystem overhead like a journal, allocation tables, etc. that take space on the filesystem will show as being used by df, but will not show with du, as they are not userspace accessible. Make a new, empty filesystem and du will should nothing but the cluster(s) for the directory(ies) in it, where df will show only the userspace accessible files on the filesystem.

example of a 2G drive ext3, so journal and lost+found directory:
Code:
$df -h /mnt
/dev/sdb1             1.9G   35M  1.8G   2% /mnt
$du -sh /mnt
20K    /mnt

the same with mkfs.vfat (no journal, small allocation table, smaller allocation of for the single directoy):
Code:
$df -h /mnt
/dev/sdb1             1.9G  4.0K  1.9G   1% /mnt
$du -sh /mnt
4.0K    /mnt

My guess is that you've got 200M worth of journal and filesystem allocation information, so you show 1.7G on df (1.7 GB of files) and 1.9G on du (1.7 + 200M filesystem stuff)
 

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GRI_MERGE(1)						      General Commands Manual						      GRI_MERGE(1)

NAME
gri_merge - merge multiple Gri output files into a single PostScript file. USAGE (style 1): gri_merge [OPTIONS] CxR a.ps b.ps ... > merged_file.ps Merges the files onto one page, in 'C' columns and 'R' rows. The CxR files are given in the order of words on a page. The page is pre- sumed to be 8.5x11in in size, as are all the input files, and the input files are sized to fit, and kept in natural scale. USAGE (style 2): gri_merge [OPTIONS] xcm ycm enlarge a.ps [b.ps ...] > merged_file.ps Where `enlarge' is a scale factor applied after offsetting `xcm' to the right and `ycm' upward. EXAMPLE (style 2): The following gri_merge 2 12 .5 a.ps 12 12 .5 b.ps 2 2 .5 c.ps 12 2 .5 d.ps > all.ps produces 4 panels from gri plots done using margins and sizes as specified in the following lines in a gri commandfile set x margin 2 set x size 15 set y margin 2 set y size 15 The OPTIONS, available if your 'perl' has 'getopts' library, are: -u graylevel -- set graylevel for underlay beneath panels, by default 0.75. Values range from 0 (black) to 1 (white), although a value of precisely 1 means do NOT draw underlay. -b graylevel -- Set value for background under individual panels, again 0 for black to 1 for white, with 1 meaning no drawing. -h -- Print this help message and quit. SEE ALSO
gri(1), gri_unpage(1) gri_merge 2009 GRI_MERGE(1)
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