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  • File creation time on Windows vs Linux

    - by Sergei
    We have following setup: mountserver - debian linux fileserver1 - Windows 2008 R2 Storage server fileserver2 - Celerra NS20 exporting CIFS share workstation - windows 7 with mapped drive to share on fileserver2 What we are doing: mounted share from fileserver1 on mountserver, e.g. /shared/fileserver1 mounted share from fileserver2 on mountserver, e.g. /shared/fileserver2 ran rsync on mountserver to sync data from fileserver1 to fileserver2.Used atime as parameter to sync data not older than X after a while tried to delete data older that Y on /shared/fileserver2. From what I see, linux stat command on mountserver returns following when quering file on /shared/fileserver2: At the same time when I open property for the same file using mapped drive connected to fileserver2,I see following for the same file: As you can see, Created date of 12 August shown in Windows Explorer is nowhere to be seen using stat command Am I missing something here?

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  • Linux per-process resource limits - a deep Red Hat Mystery

    - by BobBanana
    I have my own multithreaded C program which scales in speed smoothly with the number of CPU cores.. I can run it with 1, 2, 3, etc threads and get linear speedup.. up to about 5.5x speed on a 6-core CPU on a Ubuntu Linux box. I had an opportunity to run the program on a very high end Sunfire x4450 with 4 quad-core Xeon processors, running Red Hat Enterprise Linux. I was eagerly anticipating seeing how fast the 16 cores could run my program with 16 threads.. But it runs at the same speed as just TWO threads! Much hair-pulling and debugging later, I see that my program really is creating all the threads, they really are running simultaneously, but the threads themselves are slower than they should be. 2 threads runs about 1.7x faster than 1, but 3, 4, 8, 10, 16 threads all run at just net 1.9x! I can see all the threads are running (not stalled or sleeping), they're just slow. To check that the HARDWARE wasn't at fault, I ran SIXTEEN copies of my program independently, simultaneously. They all ran at full speed. There really are 16 cores and they really do run at full speed and there really is enough RAM (in fact this machine has 64GB, and I only use 1GB per process). So, my question is if there's some OPERATING SYSTEM explanation, perhaps some per-process resource limit which automatically scales back thread scheduling to keep one process from hogging the machine. Clues are: My program does not access the disk or network. It's CPU limited. Its speed scales linearly on a single CPU box in Ubuntu Linux with a hexacore i7 for 1-6 threads. 6 threads is effectively 6x speedup. My program never runs faster than 2x speedup on this 16 core Sunfire Xeon box, for any number of threads from 2-16. Running 16 copies of my program single threaded runs perfectly, all 16 running at once at full speed. top shows 1600% of CPUs allocated. /proc/cpuinfo shows all 16 cores running at full 2.9GHz speed (not low frequency idle speed of 1.6GHz) There's 48GB of RAM free, it is not swapping. What's happening? Is there some process CPU limit policy? How could I measure it if so? What else could explain this behavior? Thanks for your ideas to solve this, the Great Xeon Slowdown Mystery of 2010!

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  • How to append to a file as sudo?

    - by obvio171
    I want to do: echo "something" >> /etc/config_file But, since only the root user has write permission to this file, I can't do that. But this: sudo echo "something" >> /etc/config_file also doesn't work. Is there any way to append to a file in that situation without having to first open it with a sudo'd editor and then appending the new content by hand?

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  • Question about the linux root file system.

    - by smwikipedia
    I read the manual page of the "mount" command, at it reads as below: All files accessible in a Unix system are arranged in one big tree, the file hierarchy, rooted at /. These files can be spread out over several devices. The mount command serves to attach the file system found on some device to the big file tree. My questions are: Where is this "big tree" located? Suppose I have 2 disks, if I mount them onto some point in the "big tree", does linux place some "special marks" in the mount point to indicate that these 2 "mount directories" are indeed seperate disks?

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  • How to set up Mac Os X like dragging behaviour on Linux

    - by ticking
    I would like to use Linux(Fedora) on a Aluminum MacBook Pro, but since the Touchpad on a MacBook Pro is only a giant button Apple does some custom tracking. When there is one finger placed, and a second follows (the click can occur before or after that) it will be interpreted as a drag. So the strong thumb can be used to hold pressure and the more accurate index finger can do the pointing. But Linux interprets this as a right click, since it only cares if two fingers are on the pad. Is there a way to achieve said behaviour? Cheers Jan

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  • Reliable Backup Solution for Linux for Complete System Restoration

    - by Chris S
    What's the best backup solution for Linux that can completely restore the entire filesystem to a blank harddrive (including partitioning) after an old harddrive dies? I'm currently running a few Ubuntu machines, some with RAID-1 and others without RAID (mostly laptops). I'd like to implement a backup solution that can take incremental snapshots of the entire filesystem, so that if I were to replace all the harddrives in a machine, I could use the backup to restore a perfect copy of the previous filesystem. Unfortunately, nearly all the backup solutions I've found seem to be glorified rsync scripts, which only backup some files, and have no easy way to restore once the entire filesystem is gone. Some of the more complicated solutions, like Bacula, might do what I need, but require a complicated server/client setup and are notoriously difficult to maintain. I've heard that Apple's TimeMachine utility has this ability, and I've had similar success taking differential disk images with Acronis True Image on Windows, but of course neither of these work on Linux. Is there anything comparable for Ubuntu?

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  • Segmentation in Linux : Segmentation & Paging are redundant?

    - by claws
    Hello, I'm reading "Understanding Linux Kernel". This is the snippet that explains how Linux uses Segmentation which I didn't understand. Segmentation has been included in 80 x 86 microprocessors to encourage programmers to split their applications into logically related entities, such as subroutines or global and local data areas. However, Linux uses segmentation in a very limited way. In fact, segmentation and paging are somewhat redundant, because both can be used to separate the physical address spaces of processes: segmentation can assign a different linear address space to each process, while paging can map the same linear address space into different physical address spaces. Linux prefers paging to segmentation for the following reasons: Memory management is simpler when all processes use the same segment register values that is, when they share the same set of linear addresses. One of the design objectives of Linux is portability to a wide range of architectures; RISC architectures in particular have limited support for segmentation. All Linux processes running in User Mode use the same pair of segments to address instructions and data. These segments are called user code segment and user data segment , respectively. Similarly, all Linux processes running in Kernel Mode use the same pair of segments to address instructions and data: they are called kernel code segment and kernel data segment , respectively. Table 2-3 shows the values of the Segment Descriptor fields for these four crucial segments. I'm unable to understand 1st and last paragraph.

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  • Using fedora 17 commandline 'mail' program cannot send to hotmail

    - by Eric Leschinski
    I am trying to use the console in Fedora 17 to send an automated email to myself. I run this: echo "email content" | mail -s "blah" [email protected] It works fine, google treats it as a spam email, but when you mark it not spam everything is cool. For Hotmail there are policies to prevent the email from being sent. I do this: echo "email content" | mail -s "blah" [email protected] And the email returns as undeliverable, the email does not even appear in the spam folder and I get this as a response: ----- Transcript of session follows ----- ... while talking to mx3.hotmail.com.: >>> MAIL From:<[email protected]> SIZE=685 <<< 550 DY-001 (BAY0-MC3-F8) Unfortunately, messages from 184.90.101.28 weren't sent. Please contact your +Internet service provider. You can tell them that Hotmail does not relay dynamically-assigned IP ranges. +You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. 554 5.0.0 Service unavailable So apparently hotmail doesn't like spammers so much, they they are blocking anything with a dynamically assigned IP range. Google does not do this. What is the easiest way to just get around this and send an email to hotmail and end up in their spam folder to be unblocked later by the user?

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  • Is a ext3 Linux filesystem byte order independent

    - by Lothar
    I have a good old HP-C3700 Workstation with PA-RISC CPU here that I would like to use as a subversion server for a very large repository. I just worry what happens if the workstation dies (everybody who knows this computer knows that it is running like an Abrams tank and unlikely to happen in the next decade). I'm using Debian Linux on this system. If the mainboard dies can I just plug the SCSI drive into a PC and read the files from a normal Intel Linux PC? Which software RAID levels would be safe?

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  • New Linux Mint User Networking questions

    - by nyCecilia
    I have a readynas that I've been using with XP, Vista, and Win7. Because of weirdness with Vista, it is set up for full read/write guest access. Now I have a Linux Mint netbook. I have set up smb on it and can read from the readynas smb shares, but I can't write. What else can I check? Part2--(keep in mind my network knowledge is small...or smaller) what is the difference between NFS and SMB, can a readynas be set up to allow access to the SMB shares via NFS (if I can figure out NFS lol)? A link to a guide for beginners would be appreciated, google searching "Linux Mint Readynas" doesn't give me anything useful.

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  • Open Microsoft Publisher Document on Linux

    - by Peter
    I'm pretty sure the options consist of Just don't do it (use a nice open standard file format). Not great when someone sends you something. Translate the format on Windows. I think you need Publisher, the viewer won't even print. But you can download a trial version for a once off (been there, done that). Submit the file for online translation to PDF. www.pdfonline.com/convert-pdf/ Use a Windows VM, wine, crossover office, Win4Lin, or otherwise run Publisher "under" linux. What I really want to do is convert it to something nicer natively under Linux.

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  • "sh: /usr/sbin/xenstored: not found" - But it's there?

    - by Matt H
    What would cause running the file /usr/sbin/xenstored to print sh: /usr/sbin/xenstored: not found However, the file /usr/sbin/xenstored is there and is not a symbolic link. Actually I should be running this as root. That prints a similarly odd message. sudo: unable to execute /usr/sbin/xenstored: No such file or directory By the way, xenstored is not a script, it's an ELF executable. My guess is that it's because I haven't gotten all the dependent libraries installed. However, I would expect it to say something like this: ./xenstored: error while loading shared libraries: libxenctrl.so.4.0: cannot open shared object file: No such file or directory Which is true of running xenstored on a system that doesn't have all the required libraries. Why do I get "not found" vs the much more useful "cannot open shared object file"?

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  • Printer Brother DCP-110C Linux 64-bit drivers

    - by Ondra Žižka
    Hi, I need 64-bit Linux driver for DCP-110C (for Ubuntu 10.04 64-bit) I found only 32-bit here. http://welcome.solutions.brother.com/bsc/public_s/id/linux/en/index.html I've tried to follow those instructions. During the installation, I got this: ondra@ondra-doma:~/Downloads$ sudo dpkg -i --force-all dcp110clpr-1.0.2-1.i386.deb dpkg: warning: overriding problem because --force enabled: package architecture (i386) does not match system (amd64) (Reading database ... 257283 files and directories currently installed.) Preparing to replace dcp110clpr 1.0.2-1 (using dcp110clpr-1.0.2-1.i386.deb) ... Unpacking replacement dcp110clpr ... Setting up dcp110clpr (1.0.2-1) ... ln: creating symbolic link `/usr/lib/libbrcompij2.so.1.0': File exists ln: creating symbolic link `/usr/lib/libbrcompij2.so.1': File exists ln: creating symbolic link `/usr/lib/libbrcompij2.so': File exists After installation, the printer is listed at the cups server, but does not work (no command has any effect on printer (which is, of course, on and connected)). Anyone has found some working solution? Thanks, Ondra

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  • Linux Security/Sysadmin Courses in London?

    - by mister k
    Hi, My employer has offered to send me on a couple of training courses and I'm just looking for some recommendations. I'm mainly looking to improve my security and general sysadmin skills. I would like to do something focused on UNIX as I mainly work with Linux boxes (but also a couple of FreeBSD boxes). I don't want to do a study-from-home course, so I would need to find somewhere based in London. It would be great to hear from anyone who has some experience with this kind of course. The courses I've found so far are: www.learningtree.co.uk/courses/uk433.htm www.city.ac.uk/cae/cfa/computing/systems_it/linux.html www.city.ac.uk/cae/cfa/computing/systems_it/unix_tools_ss.html I'm not sure the City University courses are advanced enough as I already have experience... Thanks!

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  • Advantages of Using Linux as primary developer desktop

    - by Nick N
    I want to get some input on some of the advantages of why developers should and need to use Linux as their primary development desktop on a daily basic as opposed to using Windows. This is particulary helpful when your Dev, QA, and Production environments are Linux. The current analogy that I keep coming back to is. If I build my demo car as a Ford Escort, but my project car is a Ford Mustang, it doesn't make sense at all. I'm currently at an IT department that allows dual boot with Windows and Linux, but some run Linux while the vast majority use Windows. Here's several advantages that I've came up with since using Linux as a primary desktop. Same Exact operating system as Dev, QA, and Production Same Scripts (.sh) instead of maintaining (.bat and *.sh). Somewhat mitigated by using cygwin, but still a bit different. Team learns simple commands such as: cd, ls, cat, top Team learns Advanced commands like: pkill, pgrep, chmod, su, sudo, ssh, scp Full access to installs typically for Linux, such as RPM, DEB installs just like the target environments. The list could go on and on, but I want to get some feedback of anything that I may have missed, or even any disadvantages (of course there are some). To me it makes sense to migrate an entire team over to using Linux, and using Virtual Box, running Windows XP VM's to test functional items that 95% of most of the world uses. This is similar but a little different thread going on here as well. link text

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  • Rail's FileStore with Linux Disk Caching or RAMdisk?

    - by Yo Ludke
    I have a Ruby on Rails application that stores it's catched files on the filesystem (Rails file-system cache). I was thinking about changing to memcached Store, but a short test shows it isn't a big difference in speed. From linuxatemyram.com I learned a bit about file caching. On the current machine there would be around 40..45GB RAM left which isn't needed for the application and which can be used to linux-disk-cache this rails file cache store. The disk is a RAID10 system with almost 120MB disk perfomance. How can I tell Linux to use free RAM more deliberately and not to be shy about using it? Do think it's necessary to adjust a sysyctl/.. value here, or would I have performance advantages to put the File Store root diretory on a ramdisk? (Loosing the cache during a reboot wouldn't be a problem)

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  • setting up a WGR614v7 behind a linux box

    - by commodore fancypants
    Here's the setup, I have an openSUSE box with 2 NICs, one goes to my home network router, the other has DHCP running and it attached to a wireless router. I'm trying to get this setup to work before I switch to the linux box as my home network router. My DHCP will offer the wireless router (a WGR614v7) an address, but anything that connects to the wireless router ends up with a APIPA address. I have all the firewalls on the wireless network turned off as well as the wireless router's own DHCP. The linux box isn't offering addresses to anything past the wireless router. Is this a problem with the router or my DHCP setup? For testing purposes, I have both NICs set in the internal zone and I've tried wireless and wired connections to the WGR614v7 both to no avail.

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  • Hearing repeated sound in Linux mint Chrome Browser

    - by aravind.udayashankara
    I am using Linux mint OS since an Year , I use to consistently download updates and install , I use chrome as a default browser , when ever I open youtube and watch some video , I listen to some repetition in sound ( say repeated lyrics of song ) while it is playing , In firefox it is working fine . What is the problem am I missing any plugin , AFAIK Chrome doesn't need a flash player plug in , It has a built in flash player . IS that the problem ? And also previously I was not facing this , recently I started using Cinimon UI centOS after this all these kind of problems started MY hard ware is 64 bit intel core i3 and also I have installed linux mint 64 bit Please let me know what is the problem and how to fix this . Thanks in advance for responding to this post

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  • Can't boot into Linux partition after installation

    - by Otto
    I just installed Ubuntu. I created a partition in MacOSx using Disk utility, then deleted the partition and installed Ubuntu on the free space created. After the installation, Ubuntu said it would reboot. I hang on shutdown (which is normal, as google told me), so I used the power button to turn the MacBook off. Now I want to boot into Ubuntu. Pressing option/alt on startup only shows me the MacOSx and Windows partition. Also, the Linux partition isn't showing up on my MacOSx desktop. And in Disk Utility, I can see 3 grayed out partitions: "disk0s4", "disk0s5" and "Linux Swap". What can I do to boot into Ubuntu without losing my other partitions? Thank you for your help.

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  • Create NTFS symbolic links from within Linux

    - by rymo
    Is there a Linux utility that can create NTFS symbolic links? That is, a link on an NTFS partition that points to another NTFS folder - one that will work within Windows 7, specifically. I wish to relocate a folder that is normally in-use while Windows is running. This machine can already dual-boot into Ubuntu, so I'd like to leverage that. EDIT: To keep this from potentially turning into "which Windows Live CD is best", I will limit this question to "Is it possible with Linux, yes or no?"

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  • mirroring linux server to external usb harddrive

    - by DuPie
    My google-fu must be sucking. i havent been able to find a good solution for the following: numerous Linux server on commodity hardware Trying to do a recovery mirror copy to external harddrives External harddrives are smaller than source harddrives, but larger than data External drives are connected via usb2 (slow) Servers range from 20GB of data to 400GB of data Servers are remote, so hands on access is a pain need to copy boot files. empty external drives currently Basicly, looking for a way to do use a ghosting solution from INSIDE a running linux server to an external harddrive, without booting a cd etc. the rsync/cpio solutions i've looked at dont work great with grub/dev/proc etc. I understand that since the system isnt offline, it wont be a "mirror" image as files change, but thats ok. Are there any free/commercial products that would work?

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  • Linux servers seeing bad download performance behind Sonicwall firewall

    - by Joshua Penix
    I'm working with a pair of co-located CentOS Linux servers sitting behind a Sonicwall PRO 2040 Enhanced firewall running in transparent bridge mode. These servers are having a strange problem downloading files more than a few megabytes in size. For example, if I try to wget or FTP a copy of the Linux kernel from kernel.org, the first ~1-2MB will download at 600+K/s, and then throughput will drop off a cliff to 1K/s. I've reviewed all the firewall configuration settings for anything suspicious, but found nothing. More interestingly, I performed the same download with a Windows server sitting behind the same firewall, and it sailed right through at 600+K/s the whole way. Has anyone seen this? Where should I start looking to troubleshoot this problem?

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  • What does % mean in linux / how to install jmf

    - by Ben
    I am fairly new to linux and am using fedora 14 (64 bit). I have to install the java media framework for one of my projects. In the installation instructions on their website (http://www.oracle.com/technetwork/java/javase/download-142937.html) they use the % symbol. I have done some research and googling and can't find what the significance of % is. Does anyone know? I have been able to find just about every other symbol meaning (., .., #, and more). They use it in the following context Run the command % /bin/sh ./jmf-2_1_1e-linux-i586.bin

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