09-12-2012
Hi,
<
https://www.unix.com/unix-dummies-que...isk-space.html >
The links explains that df will use the block size to give the usage details. My system block size is 1024bytes and for that the outputs are not matching. I already know that block size is something which affects the usage reported, but my question was after implementing that logic. I used DU with block size of 1024 and df space is also using 1024 b block size (or let me know how to check df's used block size)
My query still remains...
regards,
Dexter
---------- Post updated at 10:41 AM ---------- Previous update was at 10:34 AM ----------
And BTW, I talked about "dfspace" and not "df". Reporting by dfspace is in MB . I donot know the underlying princile of how it reports the usage.
Dexter
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DF(1) User Commands DF(1)
NAME
df - report file system disk space usage
SYNOPSIS
df [OPTION]... [FILE]...
DESCRIPTION
This manual page documents the GNU version of df. df displays the amount of disk space available on the file system containing each file
name argument. If no file name is given, the space available on all currently mounted file systems is shown. Disk space is shown in 1K
blocks by default, unless the environment variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
If an argument is the absolute file name of a disk device node containing a mounted file system, df shows the space available on that file
system rather than on the file system containing the device node (which is always the root file system). This version of df cannot show
the space available on unmounted file systems, because on most kinds of systems doing so requires very nonportable intimate knowledge of
file system structures.
OPTIONS
Show information about the file system on which each FILE resides, or all file systems by default.
Mandatory arguments to long options are mandatory for short options too.
-a, --all
include dummy file systems
-B, --block-size=SIZE
use SIZE-byte blocks
--total
produce a grand total
-h, --human-readable
print sizes in human readable format (e.g., 1K 234M 2G)
-H, --si
likewise, but use powers of 1000 not 1024
-i, --inodes
list inode information instead of block usage
-k like --block-size=1K
-l, --local
limit listing to local file systems
--no-sync
do not invoke sync before getting usage info (default)
-P, --portability
use the POSIX output format
--sync invoke sync before getting usage info
-t, --type=TYPE
limit listing to file systems of type TYPE
-T, --print-type
print file system type
-x, --exclude-type=TYPE
limit listing to file systems not of type TYPE
-v (ignored)
--help display this help and exit
--version
output version information and exit
SIZE may be (or may be an integer optionally followed by) one of following: kB 1000, K 1024, MB 1000*1000, M 1024*1024, and so on for G, T,
P, E, Z, Y.
AUTHOR
Written by Torbjorn Granlund, David MacKenzie, and Paul Eggert.
REPORTING BUGS
Report df bugs to bug-coreutils@gnu.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
COPYRIGHT
Copyright (C) 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
SEE ALSO
The full documentation for df is maintained as a Texinfo manual. If the info and df programs are properly installed at your site, the com-
mand
info coreutils 'df invocation'
should give you access to the complete manual.
GNU coreutils 7.1 July 2010 DF(1)