Things are not quite this simple. There are two different concepts of size here.
The 1558 does mean that a program can read 1558 bytes from this files. An attempt to read byte 1559 will fail with an EOF being returned. This is one concept of size.
But I think that Alan is actually interested in the second concept which is how much disk space is consumed by the file. The answer is that 8 * 512 = 4096 bytes of disk space is being using by this file. And that 8 came from the first column of the "ls" listing.
So if a program adds a byte to the file, making that 1558 to be a 1559, no additional disk space is needed.
This difference becomes very important because unix supports sparce files. If Alan wrote a program that seeks to byte 1,999,999,999 and writes a single byte, he will see something like this:
16 -rwx------ 1 root sys 2000000000 Dec 30 14:06 sparsefile
(Hmmmm... I would have predicted 8. Apparently a full block was allocated instead of a fragment. This was on HP-UX 11.00 on a vxfs filesystem.)
Database programs like Oracle will do this so it happens more often than you may think.
Here is my program in case you'd like to try it...
Does anyone know a way to determine the maximum filesize on a file system on Solaris, HP-UX, AIX, Linux, and OSF1 using the command line?
TIA (2 Replies)
hi all,
in my server there are some specific application files which are spread through out the server... these are spread in folders..sub-folders..chid folders...
please help me, how can i find the total size of these specific files in the server... (3 Replies)
Hi
is there a cmd in hpux 11 to determine the physical size of the hard disk.
not bdf command.
i have searched the other threads here but cant find an answer.
thank you guys (4 Replies)
#!/bin/sh
##########################################################################################################
#This script is being used for AOK application for cleaning up the .out files and zip it under logs directory.
# IBM
# Created
#For pdocap201/pdoca202 .out files for AOK
#1.... (0 Replies)
Hi everybody,
I need to calculate the tcp buffer size of a network switch, since it's not specified in the manual; how do I do this?
I have some machines connected to the switch and I can run some socket tests written in C between these machines (I can choose how many bytes to send and... (0 Replies)
Hi Experts,
I have a script like
$ORACLE_HOME/bin/sqlplus username/password # << ENDSQL
set pagesize 0 trim on feedback off verify off echo off newp none timing off
set serveroutput on
set heading off
spool Schemaerrtmp.txt
select ' TIMESTAMP COMPUTER NAME ... (5 Replies)
I have been searching both on Unix.com and Google and have not been able to find the answer to my question. I think it is partly because I can't come up with the right search terms.
Recently, my virtual server switched storage devices and I think the problem may be related to that change.... (2 Replies)
I have file listed like below
-rw-r--r--+ 1 test test 17M Nov 26 14:43 test1.gz
-rw-r--r--+ 1 test test 0 Nov 26 14:44 test2.gz
-rw-r--r--+ 1 test test 0 Nov 27 10:41 test3.gz
-rw-r--r--+ 1 test test 244K Nov 27 10:41 test4.gz
-rw-r--r--+ 1 test test 17M Nov 27 10:41 test5.gz
I... (5 Replies)
When I create a bootable Linux distro installation USB drive, I use this command: sudo dd if=/Path/to/linux_distro.iso of=/dev/rdisk<disk number>
bs=<number of bytes>
When I look it up, I've seen variations of people choosing 4M, and I think 8M, 2M, and maybe even 1M.
If I leave the operand... (4 Replies)
Discussion started by: Quenz
4 Replies
LEARN ABOUT DEBIAN
cfdisk
CFDISK(8) GNU cfdisk Manual CFDISK(8)NAME
GNU cfdisk - a curses-based partition table manipulation program
SYNOPSIS
cfdisk [options] [device]
DESCRIPTION
cfdisk is a disk partition manipulation program, which allows you to create, destroy, resize, move and copy partitions on a hard drive
using a simple menu-driven interface. It is useful for organising the disk space on a new drive, reorganising an old drive, creating space
for new operating systems, and copying data to new hard disks. For a list of the supported partition types, see the --list-partition-types
option below.
OPTIONS -h, --help
displays a help message.
-v, --version
displays the program's version.
-a, --arrow-cursor
use an arrow cursor, instead of reverse video highlighting, in case your terminal doesn't support it.
-z, --new-table
create a new partition table on the disk. This is useful if you want to change the partition table type or want to repartition you
entire drive. Note that this does not delete the old table on the disk until you commit the changes.
-u, --units=UNIT
sets the default display units to UNIT. A list of possible units is given below.
-t, --list-partition-types
displays a list of supported partition types and features.
UNITS
You can choose in what unit cfdisk should display quantities like partition sizes. You can choose from sectors, percents, bytes, kilobytes,
etc. Note that one kilobyte is equal to 1,000 bytes, as this is consistent with the SI prefixes and is used by hard disk manufacturers. If
you prefer to see the sizes in units with binary prefixes, you should instead select one kilo binary byte (kibibyte), which is equal to
1,024 bytes. Whatever display unit you have chosen, you can always enter the quantities in the unit of your choice, for example 1000000B or
1000kB.
compact
display each size in the most suitable unit from B, kB, MB, GB and TB.
B one byte
kB one kilobyte (1,000 bytes)
MB one megabyte (1,000,000 bytes)
GB one gigabyte (1,000,000,000 bytes)
TB one terabyte (1,000,000,000,000 bytes)
KiB one kilo binary byte (1,024 bytes)
MiB one mega binary byte (1,048,576 bytes)
GiB one giga binary byte (1,073,741,824 bytes)
TiB one tera binary byte (1,099,511,627,776 bytes)
s one sector. It depends on the sector size of the disk. You can use it if you want to see or choose the exact size in sectors.
% one percent from the size of the disk
cyl one cylinder. It depends on the cylinder size.
chs use CHS display units.
BUGS
There are no known bugs. We are in early stages for development, so be careful.
SEE ALSO fdisk(8), mkfs(8), parted(8) The cfdisk program is fully documented in the info(1) format GNU cfdisk User Manual manual.
fdisk 16 June, 2006 CFDISK(8)