07-06-2008
du and df are fundamentally different. df reports on a filesystem as a whole, while du reports on individual files. Yes, du cannot see deleted files that are still open. Mostly, those are caused by folks who use the rm command without thinking. The space will be freed when the process exits and a reboot will kill all processes. So a reboot will tend to equalize usage reported by the commands and not rm'ing open files will help stop it from happening in the first place. But not all filesystem space is devoted to files. There is meta-data too...inodes, cylinder groups, super blocks, etc. They will never be the same...and if they were, what would be the point of a duplicate command?
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QUOT(8) BSD System Manager's Manual QUOT(8)
NAME
quot -- display disk space occupied by each user
SYNOPSIS
quot [-acfhknv] [filesystem ...]
DESCRIPTION
quot is used to gather statistics about the disk usage for each local user.
The following options are available:
-a Include statistics for all mounted filesystems.
-c Display three columns containing number of blocks per file, number of files in this category, and aggregate total of blocks in files
with this or lower size.
-f For each user, display count of files and space occupied.
-h Estimate the number of blocks in each file based on its size. Despite that this doesn't give the correct results (it doesn't account
for the holes in files), this option isn't any faster and thus is discouraged.
-k By default, all sizes are reported in 512-byte block counts. The -k options causes the numbers to be reported in kilobyte counts.
-n Given a list of inodes (plus some optional data on each line) in the standard input, for each file print out the owner (plus the
remainder of the input line). This is traditionally used in the pipe:
ncheck filesystem | sort +0n | quot -n filesystem
to get a report of files and their owners.
-v In addition to the default output, display the number of files not accessed within 30, 60 and 90 days.
ENVIRONMENT
BLOCKSIZE If the environment variable BLOCKSIZE is set, and the -k option is not specified, the block counts will be displayed in units of
that size block.
SEE ALSO
df(1), quota(1), getbsize(3), getmntinfo(3), fstab(5), mount(8)
BSD
February 8, 1994 BSD