I have just created a usb boot disk so that I can install Fedora 14.I used the following which was successfully. However, I am left wondering what does the bs parameter actually does. I know it mean bytes and copies these at a time. But how do I know what to set it to?dd if=F14-Live-i686.iso of=/dev/sdb bs=8MIn the above example it is set to 8MB. However could I set this to any value that I want?
View 1 RepliesI am created one udp socket. i want to send the data(bytes) to another PC.i need to send 614400 bytes of data. while sending it saying error like" message is too long ". so what is the maximum possible data can i send from a socket?
View 3 Replies View RelatedWe have a program that catalogs to 40 different mount points. The program is fine as long as thier is free space on at least one of the 40 mount points. My boss wants me to come up with a script that will email us daily to know how much overall free space is left. I know I can do a df but I don't know how to combine the 40 mount points into a single disk used/disk free report.
The 40 mount points are /dev/mapper/areaxx, xx being 01 to 40.
i would like to add 8 bytes of data to the begigning of a binary file.is there a command for this?
View 2 Replies View RelatedI recently had to move to a new machine, everything went well except for one thing. I did fresh installation of LAMP server all with default configs. Every time I'm using PHP script to that invokes include, require or require_once I get the following error:
Code: Fatal error: Allowed memory size of 20971520 bytes exhausted (tried to allocate 7680 bytes) in /var/www/index.php on line 2 index.php file: PHP Code:
<?php include "index.php";?>
icukapi.php file:
PHP Code:
<?php echo "test";?>
My memory_limit in php.ini is set to 20M. I tried to increase that however it didn't quite work. PHP seems to allocate all possible space and return that message every time i try. If somebody has an idea of how to fix it I would be more than grateful. I spend quite a long time searching for an answer however the all things i found suggested increating memory_limit which in this case doesn't work.
What is a Linux command that I can run to programmatically return either 32 or 64 to indicate whether the processor is a 32 bit or 64 bit processor?
View 4 Replies View RelatedHow can I know how many shells my system support (Is there any specific command)?
View 9 Replies View RelatedIs there any command in linux to figure out , given a process, which processor the process is running? I am interested in figuring out the CPU busy and CPU idle time of that processor.
View 2 Replies View RelatedWhen I fork multiple processes, is there some command or c function to see the cpu number on which the processes are running?
View 3 Replies View RelatedI have a big file full of records like this
1, 2, 4, 5, 6
1, 3, 5, 6, 3
1, 4, 5, 6, 6
2, 4, 5, 5, 5
2, 3, 4, 5, 2
anyway i need to take the average of all rows with the same 1st number(key). i.e.
1, 3, 4.66, 5.66, 5
2, 3.5, 4.5, 5, 3.5
I know this is something awk/sed would be great for, i just dont have enough experience with them to accomplish it, Also, what about averaging those columns together? so, after I output this to a file, id like to get another like:
1, 4.58
1, 4.125
The number of colums to add might not always be 4 either. EDIT: this might be easier to do in gnuplot, so I mainly just need an answer to the first part.
I'm constantly going 'cd ../../../../'. Is there a command/alias that could let me go 'cmd 4' and I'd be taken back 4 directories?
View 8 Replies View RelatedWhat command will provide you with the number of files in your current directory?
Choose one answer.
A. ls -c
B. ls | wc -w (this one)
C. ls -n | count
D. ls -wc (this one ?)
I need to organise an external HDD such that there is no more than 500 folders on it.
Ubuntu's "Properties" pane shows only the file count, not the folder count.
Is there a simple CLI line that will tell me the number of subdirectories?
I read this thread but
Code:
anisha@linux-uitj:~> su
Password:
[code]...
I lost an important file. I know what bytes the file begins with. How can I search the partition for the sequence of bytes?
View 4 Replies View RelatedI have an external hdd which is formatted with fat for use by both on linux and windows. The issue is that I can't delete some of the files I have which show up with size 0. Also, the modification timestamp (as detected by Krusader, the file manager I am using) is 1935. How can I delete these kind of files without affecting the running fs?
View 1 Replies View RelatedI'm currently using mogrify -strip image.jpg to remove unwanted bytes from images, it was suggested I could remove further data by using jpegran from libjpeg, something like:
jpegtran -copy none -optimize -outfile image.jpg image.jpg
The problem I'm having - if it even is a problem - is that jpegtran doesn't seem to actually do anything that mogrify isn't already doing. In all my testing the filesize just stays the same. If I remove the mogrify part of my code and replace with jpegtran then it seems to perform the same function.
For example:
image without compression: 300k
image with mogrify -strip + jpegtran: 272k
image with mogrify -strip only: 272k
image with jpegtran only: 272k
I was under the impression though that mogrify just removed image profiles/comments and that jpegtran did this as well as losslessly compressing the image to make it smaller. Am I missing something?
For backup purposes, I have been trying to find out a solution for Rsync -avr sourcefolder targetfolder with Skipping 0 bytes files option.
However it seems that they are no solutions. Would someone have an idea, to skip to source files into the sourcefolder that have no content, ie. 0 bytes?
How do you calculate the number of usable bytes on a disk partition? When I do an fdisk -l I get this:
Disk /dev/md0: 192.0 GB, 192069500928 bytes
2 heads, 4 sectors/track, 46891968 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
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I have AMD Phenom 8550 triple code processor, with 2.20ghz speed and 4gb ram. I am trying to install Redhat linux 9 first time. I am new to linux. While install system hangs with message
ehci-hcd 00:13.2: PCI device 1002:4396
echi-hcd 00:13.2: irq 10, pci mem f880f800
usb.c: new usb bus registered, assigned bus number 2
PCI:00:13.2 PCI cache line size set incorrectly (64 bytes) by BIOS/FW" expecting 16
how to get rid of this message
I have a very very insane problem with my ssd sata harddisk. I did fill the harddisk, and Thunderbird complained about "no space left on device". But even if I delete some files from the harddisk, df will still say 0 blocks free. But it will decrease the number of used blocks. So it looks like it is freeing the blocks and deleting the files, but it don't put the blocks back to the free pool.
But here is where things get insane: If I log in with my normal user, I get a "No free space" when I try to write to the harddisk. But If i log in as root I can write to the file system, despite the fact that df is saying 0 blocks free. I did try to run fsck -f but it just run its test and then say that anything is fine. But it run for less then 10 seconds, is this expected on a 40GB ssd partition?.
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Mounted second hard disk still report 0 bytes even when files are already deleted in rhel5 . I already checked the lost+found and trash . It only happen that disk space on deleted files cannot be recovered after the disk reach full capacity , but if it does not reach yet its full capacity , deleting files will recover the disk space . The format of the disk I have mounted is ext3 also have tried ntfs using fuse but the same problem , once allowed to reach 0 bytes I can no longer recover space with deleting files and had to reformat and restore the backup
View 4 Replies View RelatedWhy does unix ps -l whows one number in column "PRI" but in same time ps -o pri shows another number? cpu and nice are zero for those processes
View 1 Replies View RelatedI have Ubuntu 9.04 and I would like to know what is the command to find out the number of connections per user (i.e. ssh) and also what syslog module do I need to modify and how to enable it in order to have it logged, thing is I need to generate this event in order to see it in RSA enVision, I've tried with "who" but nothing is displayed, do I need to program something besides that? or what can I do? to have no. of connections and have that logged so I can see the event in enVision.
View 3 Replies View RelatedIS there any command to see number of threads are running in a process .I have check ps -eLf but it wont show display for all the threads
View 1 Replies View RelatedI am not able to print multiple files when using the -#X (number of copies) option using lpr command.
The below is the command that i use :
lpr -#2 -o landscape -o deliver-to=Location -Pmyprinter file-name.pdf
Is there any configuration files that i need to modify for this option to be available ?
The printer that i have is using Postscript driver.
1-Can I have the shell command which allows me to have the number of reques ts/seconds under the Apache server?
2-And the number of sons threads in service/wait?
I am using the diff command with the -r option, to compare a large number of files and files in subdirectories. My main interest is to find out which files have been changed, and not what the actual changes are, and since a lot of files has been changed, it would be a lot easier to view the file names only. Is there and option for diff that might do this, or does there exist a similar tool/command that could do the job?
View 1 Replies View RelatedAfter several crashes during videos it seemed like a good idea to fsck root. Downloaded the latest systemrescuecd and ran it at boot. The error message was 'bad magic number, corrupt superblock' with a suggested command to try another superblock. That failed with the same message. Tried tune2fs to force fsck at boot and got the same message. The drive is less than 6 months old and the installed system is working more or less ok. The command I used was 'fsck.ext4 /dev/sdc2'. What am I doing wrong?
View 9 Replies View RelatedI am a brand new member
here is my question :
in a RedHat configuration :
i need to be sure that a partition has been formatted with those parameters code...