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Full Discussion: Weird 'find' results
Top Forums UNIX for Beginners Questions & Answers Weird 'find' results Post 302991841 by Don Cragun on Thursday 16th of February 2017 08:05:47 PM
Old 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:
bakunin rbatte1
 

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LEARN ABOUT NETBSD

du

DU(1)							    BSD General Commands Manual 						     DU(1)

NAME

     du -- display disk usage statistics

SYNOPSIS

     du [-H | -L | -P] [-a | -d depth | -s] [-cghkmnrx] [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.

     The options are as follows:

     -H      Symbolic links on the command line are followed.  (Symbolic links encountered in the tree traversal are not followed.)

     -L      All symbolic links are followed.

     -P      No symbolic links are followed.

     -a      Display an entry for each file in the file hierarchy.

     -c      Display the grand total after all the arguments have been processed.

     -d      Display an entry files and directories depth directories deep.

     -g      If the -g flag is specified, the number displayed is the number of gigabyte (1024*1024*1024 bytes) blocks.

     -h      If the -h flag is specified, the numbers will be displayed in "human-readable" format.  Use unit suffixes: B (Byte), K (Kilobyte), M
	     (Megabyte), G (Gigabyte), T (Terabyte) and P (Petabyte).

     -k      By default, du displays the number of blocks as returned by the stat(2) system call, i.e. 512-byte blocks.  If the -k flag is speci-
	     fied, the number displayed is the number of kilobyte (1024 bytes) blocks.	Partial numbers of blocks are rounded up.

     -m      If the -m flag is specified, the number displayed is the number of megabyte (1024*1024 bytes) blocks.

     -n      Ignore files and directories with user "nodump" flag (UF_NODUMP) set.

     -r      Generate warning messages about directories that cannot be read.  This is the default behaviour.

     -s      Display only the grand total for the specified files.

     -x      Filesystem mount points are not traversed.

     du 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.  The -H, -L and -P options over-
     ride each other and the command's actions are determined by the last one specified.

     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 -g, -h, -k, and -m options are not specified, the block counts will be dis-
		played in units of that size block.

SEE ALSO

     df(1), chflags(2), fts(3), getbsize(3), symlink(7), quot(8)

HISTORY

     A du command appeared in Version 6 AT&T UNIX.

BSD
								September 24, 2006							       BSD
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