Unix shell script for finding top ten files of maximum size Post: 302167479

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Top Forums UNIX for Dummies Questions & Answers Unix shell script for finding top ten files of maximum size Post 302167479 by sb008 on Thursday 14th of February 2008 02:19:30 PM

02-14-2008

Registered User

Quote:

Originally Posted by maheshwin

ls -l will give the output of the total directory links , so dont trust it, du is the exact form to get the info, above commands are perfectly true

-rw-rw-rw- 1 pnt pf 87843360 Feb 6 02:21 /pfta02/10.001

Type of file: - (regular)
Access permission: rw-rw-rw- (readable/writable for everyone)
(Directory) links: 1 (usually 1 for a regular file, unless there are hard links)
owner: prt
group: pf
actual size: 87843360
date of last modification: Feb 6 02:21
filenaam: /pfta02/10.001

So the difference in size has nothing to do with the number of directory links, which is 1 in this case.

The "du" command, without options, reports the size in full disk blocks (usually 512 bytes) allocated by the file, where "ls -l" reports the size of the effective data in the file.

For each file at least 1 full disk block is allocated (actually 2 disk blocks), even of it contains just 1 byte of data.

Files always allocate space in full disk blocks.

Since the "du" commands reports in disk blocks, the result will always be a little bit more than the size reported by "ls -l".

The size of the file = 87843360 bytes
To store this amount of bytes at least 87843360/512 = 171569,0625 disk blocks are needed.

Rounded this would be 171570 full disk blocks. At least 1 extra block is needed, which makes it 171571.

The "du" command reports a size of 171572 blocks which is still 1 block more.

This means the file is most likely split up in 2 fragments.

Where the last block in each segment is not fully filled.

sb008

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LEARN ABOUT LINUX

dh_compress

DH_COMPRESS(1)							     Debhelper							    DH_COMPRESS(1)

NAME

       dh_compress - compress files and fix symlinks in package build directories

SYNOPSIS

       dh_compress [debhelperoptions] [-Xitem] [-A] [file...]

DESCRIPTION

       dh_compress is a debhelper program that is responsible for compressing the files in package build directories, and makes sure that any
       symlinks that pointed to the files before they were compressed are updated to point to the new files.

       By default, dh_compress compresses files that Debian policy mandates should be compressed, namely all files in usr/share/info,
       usr/share/man, files in usr/share/doc that are larger than 4k in size, (except the copyright file, .html and other web files, image files,
       and files that appear to be already compressed based on their extensions), and all changelog files. Plus PCF fonts underneath
       usr/share/fonts/X11/

FILES

       debian/package.compress
	   These files are deprecated.

	   If this file exists, the default files are not compressed. Instead, the file is ran as a shell script, and all filenames that the shell
	   script outputs will be compressed. The shell script will be run from inside the package build directory. Note though that using -X is a
	   much better idea in general; you should only use a debian/package.compress file if you really need to.

OPTIONS

       -Xitem, --exclude=item
	   Exclude files that contain item anywhere in their filename from being compressed. For example, -X.tiff will exclude TIFF files from
	   compression.  You may use this option multiple times to build up a list of things to exclude.

       -A, --all
	   Compress all files specified by command line parameters in ALL packages acted on.

       file ...
	   Add these files to the list of files to compress.

CONFORMS TO

       Debian policy, version 3.0

SEE ALSO

       debhelper(7)

       This program is a part of debhelper.

AUTHOR

       Joey Hess <joeyh@debian.org>

8.9.0ubuntu2.1							    2012-06-12							    DH_COMPRESS(1)