General :: Dd Block Input/output Size?

Mar 8, 2010

I'm trying trying to understand dd, and I'd like to know why frequently do we have to use a block read/write size, like "dd bs=1024", "dd ibs=512"... If it executes the operation byte by byte, isn't it irrelevant? What is this block size then?

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Hardware :: Mem - 'input Output Error On Sr0 Logical Block (a Large Number) After A Long Time The Booting Proceeds To A Point

Aug 29, 2010

I have been having a lot of trouble lately with installing from CD/DVD. The DVD reader/writer on this laptop is new. Nevertheless, trying to install Ubuntu onto an exernal HD, I get 'input output error on sr0 logical block (a large number) After a long time the booting proceeds to a point, but I never get the actual installation started, and have to shut down manually.

The CD is fine, says the Ubuntu-checker. I just installed using my sons laptop, and there was no trouble. Question: does this indicate a motherboard failure? A memory block damaged? Do you know of a diagnostic tool I can use to check the reading of a CD/DVD?

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Ubuntu :: Pdftk Output File With Pages Extracts Same Size As Input File?

Apr 22, 2011

I am curious if perhaps I am doing something wrong extracting pages from a pdf doc using pdftk and creating a new file. I am only extracting the odd pages from the file and outputting them to a new file that is now only 20 pages instead of the input's 40 pages, yet the new output file is still 1.4Mb in size, the same as the original.

It seems strange to extract only half the pages of a large document and end up with a result that is the same size. how to streamline the resulting pdf's using pdftk?

BTW this is the command I am using, in case perhaps I am missing an option to optimize file size or something:

Code:
pdftk A=ch15.pdf cat A1-40odd output odd.pdf

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General :: Block Size For Disk Cloning With Diskdump (dd)?

Jan 17, 2011

I use dd in its simplest form to clone a hard drive dd if=INPUT of=OUTPUT However, I read in the manpage that dd knows a blocksize parameter. I was wondering whether there is an optimal value for the blocksize parameter that will speed up the cloning procedure?

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General :: Cannot Mount Ext4 Fs With Block Size Of 65536

Feb 5, 2011

I am doing some benchmarking on EXT4 performance on Compact Flash media. I have created an ext4 fs with block size of 65536. however I cannot mount it on ubuntu-10.10-netbook-i386. (it is already mounting ext4 fs with 4096 bytes of block sizes) According to my readings on ext4 it should allow such big block sized fs. I want to hear your comments.

[Code]...

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General :: Block Size Explanation In Plain English?

Apr 8, 2011

what block size means in plain English? I know block size 4k has 2 TB of file size limit and 1024 has around 17 GB. How do they calculate this?

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General :: Mount An NTFS Drive Which Has A Different Block Size?

Mar 31, 2010

I have reformatted my hard drive with allocation size 64K(formatted on windows with 64k setting) for a better performance on my WDTV HD media player(dealing with large files).When I mount this drive on Linux, the properties tells me that"blksize=4096".If I keep writing files using this default setting(blksize=4096) to my NTFS formatted hard drive, will my WDTV be able to benefit from the performance improvement of 64k allocation size ?I am confused, Does it have anything to do with "blksize=4096". ?Should I try and mount my hard drive with a larger blksize ?I did some research on google but couldn't find an option to increase the blksize when mounting an NTFS pre-formatted drive

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General :: [bash] Output Of One Script Is Input Of Another?

Mar 20, 2010

Now, I have one script called "defcon" defcon gets the current DEFCON level and outputs it using echo.

Code:

#!/bin/bash
DEFCON=`curl -s http://members.tripod.com/~Swat_25/defcon.html | sed -n '/^$/!{s/<[^>]*>//g;p;}' | sed '/^$/d' | grep '[12345]$'`
echo "The current DEFCON level is $DEFCON"

The second script ("tweet") updates my twitter account.

Code:

#!/bin/bash
curl -s -u USER:PASS -d status="$@" http://twitter.com/statuses/update.xml > /dev/null

What I want to do is be able to update my twitter account with the current defcon status (this is really more of a learning thing than something I actually want to be doing). The original script for tweet replaced $@ with $1, but if I use:

tweet `defcon`

it only uses the first word in the string, similarly if I used $2 or $3.So I changed it to $@. The normal function still works, but typing:

tweet `defcon`

updates twitter with nothing.

EDIT I should mention the /dev/null is there to catch the output of curl, otherwise it won't run silently. It still updates twitter normally with the send to /dev/null

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General :: Display Specific Block Of Contents Or Lines In Output?

Apr 23, 2010

Consider a situation in which you want to display only specific lines of contents from a file or of a command's output. Yes, we have head and tail commands. But, how to view all the lines of a file except the last one or vise versa when we don't know the count of lines in advance?

Consider this output:

Code:

[root@localhost ~]# ps au | grep bash
root 6316 0.0 0.0 4672 1440 tty1 Ss+ Apr22 0:02 -bash
root 20847 0.2 0.0 4672 1432 pts/0 Ss Apr23 0:12 -bash
root 21167 0.0 0.0 3920 660 pts/0 S+ 01:00 0:00 grep bash

Here, I don't want the last line (in italic) to be included in the result since the last line is due to "grep bash" in the devised command "ps au | grep bash". Well, we can rewrite the devised command:

Quote:

"ps au | grep bash | head -n 2"

But, again, here we are specifying the count of lines to be included. But, in the presented problem we don't know any count in advance!

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General :: Cp: Reading `filename': Input/output Error?

Feb 18, 2010

I wish to know what could be the possible cases for this error:cp: reading `filename': Input/output errorI am getting this message when I am trying to copy a big file of around 50MB.

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General :: Deleting Files On USB - Input / Output Error

May 4, 2009

[root@localhost media]# ls UMESH
[root@localhost media]# cd UMESH/
[root@localhost UMESH]# ll
ls: cannot access ejb: Input/output error
total 0 d? ejb
[root@localhost UMESH]# rm -rf ejb
rm: cannot remove 'ejb': Input/output error
[root@localhost UMESH]# ll
ls: cannot access ejb: Input/output error
total 0 d? ejb
[root@localhost UMESH]#

The privileges for root for UMESH are as below:
[root@localhost media]# ll
total 4
drwxr-xr-x 3 vickey root 4096 1970-01-01 05:30 UMESH
[root@localhost media]#

Also I can't even paste a file in the USB.

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General :: Cannot Remove `<directory>': Input/output Error?

Sep 14, 2010

I have a WD external disk, NTFS file system. I mounted it on my Red Hat. While on the external disk, I deleted a directory, which was sent to .Trash-root of that disk.I went to .Trash-root and did rm -rf to completely delete that directory, but I got the following error: cannot remove `<directory>': Input/output errorWhen I do ls -la on that directory that I wish to remove, it shows me it has 0 files inside. But not only I can't remove it, I can't do anything else with it (copy, etc). And I have all the rights on that directory, so this isn't the problem.

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General :: Cannot Mount Hard Disk: Block Count Exceeds Size Of Device

May 11, 2011

I have one hard disk (call her HDA) that contains nothing but a single ext4 partition containing a backup of all my important data. Last night I did a clean install of Ubuntu 10.10 on my primary hard disk (call her HDB) and from there proceeded to upgrade directly to Ubuntu 11.04 upgrade. In 10.10, I was able to read HDA just fine. However after the upgrade, I can no longer mount this drive. When mounting from file browser:

Code:

Error mounting: mount: wrong fs type, bad option, bad superblock on /dev/sda,missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so The end of dmesg said the following:

Code:

dmesg | tail
[ 82.130904] EXT4-fs (sda): bad geometry: block count 122096646 exceeds size of device (122096381 blocks)

my hard disk has a block count greater than the size of my device. I've done my background searching on this and tried a command line utility I've never heard of before:

Code:

# sudo e2fsck /dev/sda
e2fsck 1.41.14 (22-Dec-2010)
The filesystem size (according to the superblock) is 122096646 blocks
The physical size of the device is 122096381 blocks

[code]....

this is as far as I've gotten. This drive holds over a decade's worth of work for me and is extremely valuable. I really didn't think that the Ubuntu upgrade process would mess with this drive, seeing as the Ubuntu install was contained on an entirely different drive. What is it that I need to do to restore my drive to working status?

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General :: Generate Random List And Determine Size Of Arbitrary Block Of Files In Dir?

Mar 4, 2010

I want to generate a temporary random list from a directory of files and then determine the size of an arbitrary block of files from this list (say 1-25 or 26-50) and add their names to a file along with some other info for each name. I can generate a random list with file sizes like this: ls -l | sort -R | cut -d " " -f 6 but i'm not sure how to add up the sizes of just a certain block of these files and at the same time save the file names.

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General :: Recovery Disc States Cannot Read Input/output Error?

Nov 15, 2010

Pavillion laptop crashed and I can not find all of my recovery discs. The computer will not allow me to do an internal recovery so I ordered a recovery download on line and burned to a disc. when I put the disc in the graphics came up and in started in Live-mode but then the error mess came: error while loading shared libraries: /usr/lib/libpci.so.3: cannot read file data: input/output error. The site said it was an ISO file but then it had a program it had me run to change it and burn the disc.

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General :: Evaluate Size Of Output Command?

Nov 18, 2010

I'm trying to do something like this:

Code:
#!/bin/bash
cmd1=$(cat /var/log/messages | grep -e 'blocked for more than 120 seconds' | cut -c 55-62)
if $cmd1 != 0; then echo 'okay'; fi

however i'm messing up somewhere... bash attempts to evaluate the elements in cmd1. when I try to run this script it complains saying:

Quote:

test1.sh: line 5: blocked: command not found

I am open to alternatives. My intent is to replace cat /var/log/messages with dmesg, so I can attempt to determine if a problematic application I use encounters a blocked state (unresponsive for more than 120 seconds).

Should I be using a different test condition? I tried something like:

Code:
# this declares cmd1 as an array
cmd1=($(cat /var/log/messages | grep -e 'blocked for more than 120 seconds' | cut -c 55-62))
#attempt to determine if number of elements in array is greater than zero
if ${#cmd1[@]} > 0; then echo okay; fi

But I get the same error... what am I doing wrong?

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General :: Create A Single Line Of Output From Multiple Variable Lines Of Input

Feb 3, 2010

I need to create a single line of output from multiple and variable lines of input in a Linux bash shell script.

My input file looks like this:

Where there may be any number of umsecondaryphonenumber lines; if there is not a umsecondaryphonenumber line for a telephonenumber, I don't want to write any output.

So, the output file should look like:

The script I have so far is:

My question is - how do print each of the elements of an array in one record - i.e. what do I put in place of howdoiprintarray?

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Ubuntu :: Command To Get Block Size?

Mar 1, 2010

In a book, I read tha cmchk command is used to get the disk block size. But in Ubuntu, it is not allowed as command is not available.Can some body tell me what is its equivalent in Ubuntu.

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SUSE :: Change The HD Block Size

Nov 24, 2010

Does anyone have a guide/instructions to change the Block Size on a Linux disk from 4096 bytes to 1mb or more?

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General :: Windows With Putty Via USB Serial Cable To Serial Port - Output Ok, Input Isn't?

Jan 13, 2010

I am trying to get two way serial communications going between a Windows XP system and a Linux system (RHEL 5).I have /sbin/agetty -L 9600 ttyS0

in /etc/inittab. I am using a generic USB to serial adaptor on Windows (Unitek) and a null modem cable. I have putty configured for 9600 baud, 8 bits, no parity, one stop bit, no flow control.I get the login prompt from agetty in the putty window but input does not work; I see weird characters in the putty screen. I can echo output into the device from windows and see it, but

cat < /dev/ttyS0. just prints out weird characters from what I type.

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General :: Mount Nfs: Mount(2) Input/Output Error, Virtual Box Involved?

Feb 11, 2010

I'm not really sure this is the right category for this post...

I've been thinking and reading but I really don't find a solution, and this is why I decided to post here. I'm not a newbie using Linux but I know absolutely nothing about nfs and related stuff. If explanations are not clear/precise I'm sorry and absolutely open to explain myself better (I'm really desperate, at this point).

I'm running a Debian in a VirtualBox inside a RHEL5. To supply space to the virtual machine I'm trying to mount a disk (? maybe not?) that I created in the RHEL.

In RHEL: I created a directory /some/path/dir and I granted access to it from the VM (edit /etc/exports file and restart the nfs service)

In Debian: I created a directory to be used as mounting point (mkdir /other/nice/path/dir) and I tried to mount (mount -t nfs -v redhat:/some/path/dir /other/nice/path/dir). What happens next is the following:

mount.nfs: timeout set for Thu ...
mount.nfs: text-based options ...
mount.nfs: mount(2): Input/output error
mount.nfs: mount system call failed

Now, this Input/output error is too vague to trace where the problem is, but I really have no idea about how to go more in depth (are there logs somewhere? What should I look for? ... ...).

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General :: Error - Gzip :stdin:input /output Error /bin /gstar :unexpected EOF In Archive

Mar 28, 2011

when iam opening my dec_backup folder the folling error is appering :

the error is gzip :stdin:input /output error
/bin /gstar :unexpected EOF in archive
/bin /gstar: error is not recoverable :exesting now

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General :: Will Not Reboot After Install (Arch) - -bash: /sbin/reboot: Input/output Error

Oct 7, 2010

I am using sda1 as /, which is a bootable drive. I do not know if my problem is that I did not create a /boot drive. After removing the iso dvd, I tried to reboot and I get this back: -bash: /sbin/reboot: input/output error Then it returns me to the terminal prompt.

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General :: Data From Input File To Be Taken And Send To Output File?

Jul 24, 2010

I am new to shell scripting.What i am trying is to write a shell script which take the input file and output should like as mentioned below.Output file should have data till SOK (marked in red)from every second line and then the selected data(marked in green) from 4th line.So selected data from 2nd and 4th line in one line of O/P file and then similarly selected data from 6th and 8th line in second line of O/P file.Input File:

3c3
< c1111;11.11.11.11;pOK;SOK:abcde;Universe:aa
---

[code]...

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Debian :: Du Command Without 1024 Block Size

Aug 20, 2011

i'm calculating the size of directories using "du"

PHP: function du($path)
{
exec ('du -sb ' . $path, $res[]);
$size = $res[0][0];

[Code].....

But then again, it doesn't calculate the actual file size, but rather a size aligned to 1024 bytes just as Windows does that with 4096 bytes cluster size. Is there a way to calculate the actual file size? eg. 1021 bytes

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Programming :: C Program - Getting The Raw Size Of A Block Device

Oct 16, 2010

How do you go about getting the raw size of a block device under Linux from within a C program? And I mean the raw size of the block device itself, not a file system that may or may not be installed on it. And I'd like to be able to get the raw size of any block device, from hard drives (e.g., /dev/sda) to LVM partitions (/dev/mapper/vg0-home) to loop devices to anything else that is a Linux block device.

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General :: Redirecting Command Output To Input Of Another Command?

Jul 2, 2011

I want to run gsettings list-schemas (which return a list of about 100 names separated by spaces)and somehow direct each name one at a time as the input to this command:gsettings list-recursivelyI've tried it with awk, and standard | piping and also as a string variable strvar=$(gsettings list-schemas) and using the $strvar as the input butam missing something in between I'm sure like for - while or proper syntax of awk etc

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Ubuntu :: Mounting NTFS Changing The Block Size?

Mar 31, 2010

I have reformatted my hard drive with allocation size 64K for a better performance on my WDTV HD media player(dealing with large files). When I mount this drive on Linux, the mount tells me that "blksize=4096".If I keep writing files usinghis default etting(blksize=4096) to my NTFS formatted hard drive, will my WDTV be able to benefit from the performance improvement of 64k allocation size ? Should I try and mount my hard drive with a larger blksize ?I did some research on google but couldn't find an option to increase the blksize when mounting an NTFS pre-formatted drive.

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Programming :: Provide A Block Size To Open An Archive?

Jul 12, 2011

Here [URL].. it says that you need to provide a block size to open an archive. What does that mean, and what would be a good number to use?

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Ubuntu :: Output To Input ?

Jan 7, 2011

What does this command mean? Is this some sort of a pipe where output of one program goes to input of another?

Code:

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