02-16-2017
Quote:
Originally Posted by
bakunin
I don't think so: because the size (which is a small fraction of a GB) is rounded up to the next unit (GB here, therefore 1GB) all files with 1GB and less (but at least 1c) are shown.
I hope this helps.
bakunin
Hi bakunin,
No. When no units are specified, such as with
-size 2, it is looking for a file that has a size that fits in 2 512-byte blocks which corresponds to a file with a file size that is 513 through 1024 bytes. But when units are specified, an unsigned number is looking for a file with the exact size specified (at least with a BSD-based
find utility which is also used on macOS systems). Note that the POSIX standard's
find utility's
-size primary does not include a units modifier except
c (which specifies that the number is counting bytes instead of 512-byte blocks); it just has negative numbers (meaning less than number), unsigned numbers (meaning exactly that number), and positive numbers (with a leading + meaning more than number).
If some other system's
find utility treats unit modifiers as block size multipliers instead of just numbers of bytes, that difference in behavior from BSD might be a reason why POSIX hasn't standardized modifiers other than
c.
Hi bodisha,
What operating system are you using?
These 2 Users Gave Thanks to Don Cragun For This Post:
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LEARN ABOUT OPENDARWIN
du
DU(1) BSD General Commands Manual DU(1)
NAME
du -- display disk usage statistics
SYNOPSIS
du [-H | -L | -P] [-I mask] [-a | -s | -d depth] [-c] [-h | -k] [-x] [file ...]
DESCRIPTION
The du utility displays the file system block usage for each file argument and for each directory in the file hierarchy rooted in each direc-
tory argument. If no file is specified, the block usage of the hierarchy rooted in the current directory is displayed. If the -k flag is
specified, the number of 1024-byte blocks used by the file is displayed, otherwise getbsize(3) is used to determine the preferred block size.
Partial numbers of blocks are rounded up.
The options are as follows:
-H Symbolic links on the command line are followed, symbolic links in file hierarchies are not followed.
-L Symbolic links on the command line and in file hierarchies are followed.
-I mask
Ignore files and directories matching the specified mask.
-P No symbolic links are followed. This is the default.
-a Display an entry for each file in a file hierarchy.
-h "Human-readable" output. Use unit suffixes: Byte, Kilobyte, Megabyte, Gigabyte, Terabyte and Petabyte
-r Generate messages about directories that cannot be read, files that cannot be opened, and so on. This is the default case. This
option exists solely for conformance with X/Open Portability Guide Issue 4 (``XPG4'').
-s Display an entry for each specified file. (Equivalent to -d 0)
-d depth
Display an entry for all files and directories depth directories deep.
-c Display a grand total.
-k Display block counts in 1024-byte (1-Kbyte) blocks.
-x File system mount points are not traversed.
The du utility counts the storage used by symbolic links and not the files they reference unless the -H or -L option is specified. If either
the -H or -L options are specified, storage used by any symbolic links which are followed is not counted or displayed.
Files having multiple hard links are counted (and displayed) a single time per du execution.
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. If BLOCKSIZE is not set, and the -k option is not specified, the block counts will be displayed in 512-byte
blocks.
SEE ALSO
df(1), fts(3), symlink(7), quot(8)
HISTORY
A du command appeared in Version 1 AT&T UNIX.
BSD
April 1, 1994 BSD