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• Disable linux read and write file cache on partition

  - by complistic

  How do i disable the linux file cache on a xfs partition (both read an write). We have a xfs partition over a hardware RAID that stores our RAW HD Video. Most of the shoots are 50-300gb each so the linux cache has a hit-rate of 0.001%. I have tryed the sync option but it still fills up the cache when copinging the files. ( about 30x over per shoot :P ) /etc/fstab: /dev/sdb1 /video xfs sync,noatime,nodiratime,logbufs=8 0 1 Im running debian lenny if it helps.

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• How does software installation in Linux work?

  - by Saif Bechan

  I am new to Linux and trying to set up a server. For this project I need some additional software, but how to install the software I'm interested in is not always obvious. For example, this was my experience with a PHP package called htscanner: There is no installation guide on the website. The website says that the version I used did not have any dependencies, but this is incorrect. "Release 0.8.1: No dependencies registered." There is no configuration guide on the website. After I managed to get it installed it still didn't work. I decided to just uninstall it and find a better solution. Uninstalling isn't straightforward; the best answer I got is to manually look for the files and delete them. What are the basic concepts of installing and uninstalling software on Linux? How is this supposed to work?

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• Linux Alternatives to Lansweeper [on hold]

  - by Mathew MacLean

  I'm new to serverfault, and I'm hoping that this is the correct section of StackExchange for this question. Currently in my network we have a collection of linux fileservers, firewalls, etc. with all windows clients. I am looking for a network management tool, similar to lansweeper that would be able to run on linux servers. I know questions asking for software suggestions are typically frowned upon, but I have looked high and low, and I'm starting to think nothing like this exists. So if anyone could point me in the right direction it would be greatly appreciated!

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• free open-source linux screenshot & ocr tool

  - by Gryllida

  I'm looking for a tool which would be able to capture a screen region, pass it to OCR and put the result into clipboard. "import ppm:- | gocr -i - | xclip -selection c" works, but gocr is unreliable: simple text on a webpage has errors. It is a clear font but the OCR tool always misses "r" and replaces it with underscore. "import ppm:- | ocrad -i - | xclip -selection c" says "ocrad: maxval 255 in ppm "P6" file." tesseract needs an image file and does not accept piping input to it. xfce4-screenshooter does not do OCR. ABBYY Screenshot Reader is proprietary. tessnet2 is freeware running on a proprietary platform. Google Docs can OCR screenshots in a batch. But my data is confidential and better not put online. Graphical interface solutions would be acceptable for this question, too. There is a number of existing SuperUser questions about OCR. They fall in several categories. Questions just about OCR without the "screenshot taking" part. Open Source OCR for linux Free OCR for Arabic text Looking for recommendations on OCR problem - tabular numeric data Which has better OCR applications: Ubuntu, or Mac/iPad, or Windows? How can I preform OCR from the command line? OCR solution on linux machine from command line (duplicate) Free OCR software OCR for Sanskrit ( OR devanagari) Copy image and paste to OCR (windows) File processing OCR instead of screenshot. Online OCR website for processing an entire pdf file at one time? Practical OCR solution for converting a large book to a digital format? How to extract text with OCR from a PDF on Linux? Batch-OCR many PDFs OCR Image based PDF Copy image and paste to OCR Extract OCR text from Evernote OCR in Word 2013 Replace (OCR) garbled text in PDF? Process files prior to running OCR. How can I make OCR recognize my documents' text better? Tesseract OCR recognition bilingual document. mistakes tolerance level setup OCR for low quality images How do I get the best quality screenshot for OCR (Optical Character Recognition) and what tool would be the best for screenshots? OCR training. Training Tesseract-OCR for english language fonts None of them answer this question.

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• Hardware selection for Linux machine

  - by bguiz

  Hi, I am building a new box, and planning to install Ubuntu 9-04 or Ubuntu 9-10 on it. I am wary of the hardware selection because in the past I struggled with lack of drivers or driver incompatibility with the network card and video card, etc. The last time I built a Linux box was 2007, and I have not kept up to date with the changes since. One notable difference is that I can no longer find motherboards with nVidia chip sets. See what I mean (links to my local shop's website): Intel motherboards: http://www.centrecom.com.au/catalog/default.php?page=1&cPath=36_62 AMD motherboards: http://www.centrecom.com.au/catalog/default.php?page=1&cPath=36_63 I have already checked the Ubuntu forums, but their motherboards section is rather outdated, and I did not look further. I would like to know your suggestions for what Linux compatible hardware that you have got. Thank you!

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• Which Linux distro for Mac Mini?

  - by spoon16

  I recently received a Mac Mini and would like to set it up as a web server and git source server. I would like to learn Linux so am interested in setting up my Mac Mini with Linux instead of OSX. Here are the main things that I will be using the Mac Mini for. git Repositories (via Gitosis) build server (build projects in git repositories using commit hooks and run tests) simple websites (PHP) learning C++ in a non-Windows environment What distribution would you recommend? Please provide some detail in your answer so that I can make an meaningful decision. Because I am looking to use the mini as more of a server than a normal desktop machine I was thinking of Ubuntu Server, I'm not sure if that is over kill though given the hardware I am using.

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• Which Linux distro for Mac Mini?

  - by spoon16

  I recently received a Mac Mini and would like to set it up as a web server and git source server. I would like to learn Linux so am interested in setting up my Mac Mini with Linux instead of OSX. Here are the main things that I will be using the Mac Mini for. git Repositories (via Gitosis) build server (build projects in git repositories using commit hooks and run tests) simple websites (PHP) learning C++ in a non-Windows environment What distribution would you recommend? Please provide some detail in your answer so that I can make an meaningful decision. Because I am looking to use the mini as more of a server than a normal desktop machine I was thinking of Ubuntu Server, I'm not sure if that is over kill though given the hardware I am using.

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• Should I be afraid of Linux server administration?

  - by markle976

  I've been trying to figure out what to focus on. I finally realized that the root of my quandary is that I am unsure about learning Linux server administration. I have been getting pretty good with PHP/MySQL and web development, but I am not very familiar with Linux. Is it hard to learn? What would I need to know in order to manage a LAMP stack? Also, which version is most used in enterprises? I think I have also hesitated to dive in because it seems like it is mostly used in small companies, but I guess that could be a good thing.

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• Which Linux distributions support IPv6?

  - by ebaccount

  Which Linux distributions support the IPv6 stack (like Windows Vista supports IPv6)?

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• PortForwarding to IIS in Linux

  - by Simon

  Hi, I am trying to set up port forwarding on a linux box to a IIS webserver on my internal network. The web server sits on Windows 2003 Server. My linux box has eth0 - Internet connection eth1 - internal subnet (10.10.10.x) eth2 - 2nd internal subnet (129.168.0.x) dhcp interface my webserver is on the eth2 interface (192.168.0.6) I am doing port forwarding for port 80 with no avail. I use the same set of rules to port forward to a different webserver and it works. The webapplication is available on the internal network but not for external users. iptables -t nat -A PREROUTING -p tcp -i eth0 -d $PUBLIC_IP --dport 80 -j DNAT --to 192.168.0.6:80 iptables -A FORWARD -p tcp -i eth0 -o eth2 -d 192.168.0.6 --dport 80 -m state --state NEW -j ACCEPT iptables -A FORWARD -t filter -o eth0 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT iptables -A FORWARD -t filter -i eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE Any Ideas?

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• Are drivers compatible between different Linux distributions?

  - by Dimitri C.

  If you have a device driver that works on one Linux distro, will it also work on another one?

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• Linux partitioning problem

  - by Claudiu

  I am using cfdisk to repartition my hdd as from OS install I only got 1 big partition a swap. I wanted to resize the big partition to 1 GB /boot and use the rest of the space for an extended partition. After I do cfdisk, I recheck the partitions with fdisk -l and I get these: Disk /dev/sda: 320 GB, 320070320640 bytes 255 heads, 63 sectors/track, 38913 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda3 1 38455 308881755 f Extended LBA Warning: Partition 3 does not end on cylinder boundary. /dev/sda2 38455 38698 1951897 82 Linux swap /dev/sda1 * 38699 38913 311349654 83 Linux My problem is the Warning message, I think I know the cause, I think its because of sda1 Blocks size. How could that be soo big if Start and End interval is small?

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• Learning Linux screencasts

  - by Dmitriy Nagirnyak

  Hi, I am trying to get started with Linux. There are number of books (many of which are just man pages), some of them provide good overview so I can dig deeper online then. What I would like is to find number of screencasts that would cover basics of Linux commands, server administration, commonly performed tasks etc (no GUI, only terminal). I want to watch the screencasts to "get it quicker" and then use a book or online resources to "dig it deeper". Any recommendations? Thanks, Dmitriy.

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• Where is Amazon Linux AMI Test Page EC2?

  - by fuzzybee

  I have set up my websites as directories directly under /var/www/html/ and they are working just fine (the websites are mapped to virtual hosts). So, this is mainly out of curiosity for the moment. Furthermore, being able to customise this might bring some benefits in the future e.g. branding the elastic IPs my computer use temporarily. Notes I can always create a index.html page under /var/www/html/ and modify it but that's not my goal here. I can also map the elastic IP address to a directory /var/www/html/default/ and do my stuffs there but that is not also my goal here My goal is the find the Amazon Linux AMI test page I've tried running Linux command to find it but it takes too long obviously

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• Aptana Under linux

  - by fatnjazzy

  Hey, I downloaded the Aptanastudio 2.0 and unzipped it in the desktop. Im trying to run Aptana studio 2.0 under OpenSuse 11 and i get the following error... Any idea y? Thanks JVM terminated. Exit code=-1 -Xms40m -Xmx384m -Djava.awt.headless=true -XX:MaxPermSize=256m -Djava.class.path=/home/avi/Desktop/Aptana Studio 2.0/plugins/org.eclipse.equinox.launcher_1.0.200.v20090520.jar -os linux -ws gtk -arch x86 -showsplash -launcher /home/avi/Desktop/Aptana Studio 2.0/AptanaStudio -name AptanaStudio --launcher.library /home/avi/Desktop/Aptana Studio 2.0/plugins/org.eclipse.equinox.launcher.gtk.linux.x86_1.0.200.v20090520/eclipse_1206.so -startup /home/avi/Desktop/Aptana Studio 2.0/plugins/org.eclipse.equinox.launcher_1.0.200.v20090520.jar -application com.aptana.ide.desktop.integration.Application -vm /usr/lib/jvm/java-1.6.0-openjdk-1.6.0/jre/bin/../lib/i386/client/libjvm.so -vmargs -Xms40m -Xmx384m -Djava.awt.headless=true -XX:MaxPermSize=256m -Djava.class.path=/home/avi/Desktop/Aptana Studio 2.0/plugins/org.eclipse.equinox.launcher_1.0.200.v20090520.jar

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• Can Linux file permissions be fooled?

  - by puk

  I came across this example today and I wondered how reliable Linux file permissions are for hiding information $ mkdir fooledYa $ mkdir fooledYa/ohReally $ chmod 0300 fooledYa/ $ cd fooledYa/ $ ls >>> ls: cannot open directory .: Permission denied $ cd ohReally $ ls -ld . >>> drwxrwxr-x 2 user user 4096 2012-05-30 17:42 . Now I am not a Linux OS expert, so I have no doubt that someone out there will explain to me that this is perfectly logical from the OS's point of view. However, my question still stands, is it possible to fool, not hack, the OS into letting you view files/inode info which you are not supposed to? What if I had issued the command chmod 0000 fooledYa, could an experienced programmer find some round about way to read a file such as fooledYa/ohReally/foo.txt?

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• Manage Upload Permissions, SFTP & Linux

  - by John R

  I'm new to Linux. I am working with a Redhat 5.5 server and am using a Java-based SFTP script that will allow multiple users to upload text files to a server. I am undecided if each user will have a separate directory or if I will use a naming convention that includes their customer ID. The files include some personal information about their LAN settings, so I prefer to use SFTP as apposed to FTP. It is my understanding that SFTP is encrypted (Also, I have a Java class configured to upload via SFTP, so I prefer not to switch protocols unless their is a very-good reason). The prototype is for a system that will support large numbers of customers and the thought of continually adding and removing clients through the command line seems highly impractical. (Again, I am new_to/learning Linux and Redhat). What are normal conventions for giving multiple users permission to SFTP upload files with a unique username and password for each.

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• Linux user that can read-only all files?

  - by ToiletOverflow

  Is it possible to create a user in Linux/Unix that can see all files on the system, but in a read-only capacity?

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• Removable vs fixed mount points in Linux

  - by Dave

  What makes a mount point removable in Linux? I am using Gentoo Linux with Gnome 3.2, and I find it annoying that some of my drives (ex: /dev/sdb) appear as removable but not the others (ex: /dev/sdc, /dev/sdd). They are all in /etc/fstab, with the same options. They are all mounted properly at startup, they all work fine under my own folders /mnt/drive2 /mnt/drive3 /mnt/drive4. But only one of them (the first) appears in Nautilus (and in the Gnome 3 notification tray) as mountable/removable, not the others. Can I add options to my fstab to hide it? Or can I probe using udevadm or whatever? It looks strange to be able to remove/unmount fixed drives that I never need to unmount nor remove. Any pointer would be good, thanks.

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• Linux - Imaging backup solution?

  - by xperator

  I want to know is there a way to make a snapshot-like backup of a linux system into a single file and restore it in another system ? You know in windows there are programs which makes a copy of a drive (like C:\ ) into a single image file. So you can restore this file later incase you are infected or something happens. Every time I want to migrate my vps into another host, I have to setup the new server from scratch and move the files manually. Can I just make a snapshot backup of the whole system and restore it somewhere else (or on the same server) ? I am not familiar with linux and I have no idea if this is technically possible or not ? Does the paritions, configs, system files,etc... are individual for each system ? I heard about rsync, but that's not what I am looking for.

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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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• 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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• Sporadic '.Xauthority not writable, changes will be ignored' going from OSX -> Linux

  - by Kamil Kisiel

  Every now and then when users SSH from their OS X (Snow Leopard) workstation to one of our Linux hosts they receive the message: /usr/bin/xauth: ~/.Xauthority not writable, changes will be ignored Of course, their X forwarded applications will not work at this point. However, if they log out and log right back in again they do not get the message and everything works as expected. On their Mac they get their home directory via AFP. The Linux machines get it via NFS. Any ideas on what could be going on here?

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• How to disable hiddev96 in linux (or tell it to ignore a specific device)

  - by Miky D

  I'm having problems with a CentOS 5.0 system when using a certain USB device. The problem is that the device advertises itself as a HID device and linux is happy to try to provide support for it: In /ver/log/messages I see a line that reads: hiddev96: USB HID 1.11 Device [KXX USB PRO] on usb-0000:00:1d.0-1 My question comes down to: Is there a way to tell linux to not use hiddev96 for that device in particular? If yes, how? If not, what are my options - can I turn hiddev96 off completely? UPDATE I should probably have been a bit more specific about what is going on. The machine is running Centos 5.0, and on top of it I'm running VMWare workstation with Windows XP - which is where the USB device is actually supposed to operate. All works fine for other USB devices (i.e. VMWare successfully connects the USB device to the guest OS and the OS can use it, but for this particular device VMWare connects it to the guest OS, but the OS can't read/write to it) Every attempt locks up the application that is trying to communicate with the device. I've reason to believe that it is because the device is a HID device and there's some contention between the Linux host and the Windows guest OS in accessing the device. Below is the output from modprobe -l|grep -i hid as requested by @Karolis: # modprobe -l | grep -i hid /lib/modules/2.6.18-53.1.14.el5/kernel/net/bluetooth/hidp/hidp.ko /lib/modules/2.6.18-53.1.14.el5/kernel/drivers/usb/misc/phidgetservo.ko /lib/modules/2.6.18-53.1.14.el5/kernel/drivers/usb/misc/phidgetkit.ko And here is the output of lsmod # lsmod Module Size Used by udf 76997 1 vboxdrv 65696 0 autofs4 24517 2 hidp 23105 2 rfcomm 42457 0 l2cap 29633 10 hidp,rfcomm tun 14657 0 vmnet 49980 16 vmblock 20512 3 vmmon 945236 0 sunrpc 144253 1 cpufreq_ondemand 10573 1 video 19269 0 sbs 18533 0 backlight 10049 0 i2c_ec 9025 1 sbs button 10705 0 battery 13637 0 asus_acpi 19289 0 ac 9157 0 ipv6 251393 27 lp 15849 0 snd_hda_intel 24025 2 snd_hda_codec 202689 1 snd_hda_intel snd_seq_dummy 7877 0 snd_seq_oss 32577 0 nvidia 7824032 31 snd_seq_midi_event 11073 1 snd_seq_oss snd_seq 49713 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi_event snd_seq_device 11725 3 snd_seq_dummy,snd_seq_oss,snd_seq snd_pcm_oss 42945 0 snd_mixer_oss 19009 1 snd_pcm_oss snd_pcm 72133 3 snd_hda_intel,snd_hda_codec,snd_pcm_oss joydev 13313 0 sg 36061 0 parport_pc 29157 1 snd_timer 24645 2 snd_seq,snd_pcm snd 52421 13 snd_hda_intel,snd_hda_codec,snd_seq_oss,snd_seq,snd_seq_device,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer ndiswrapper 170384 0 parport 37513 2 lp,parport_pc hci_usb 20317 2 ide_cd 40033 1 tg3 104389 0 i2c_i801 11469 0 bluetooth 53925 8 hidp,rfcomm,l2cap,hci_usb soundcore 11553 1 snd cdrom 36705 1 ide_cd serio_raw 10693 0 snd_page_alloc 14281 2 snd_hda_intel,snd_pcm i2c_core 23745 3 i2c_ec,nvidia,i2c_i801 pcspkr 7105 0 dm_snapshot 20709 0 dm_zero 6209 0 dm_mirror 28741 0 dm_mod 58201 8 dm_snapshot,dm_zero,dm_mirror ahci 23621 4 libata 115833 1 ahci sd_mod 24897 5 scsi_mod 132685 3 sg,libata,sd_mod ext3 123337 3 jbd 56553 1 ext3 ehci_hcd 32973 0 ohci_hcd 23261 0 uhci_hcd 25421 0

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• Manual Duplex printing for Mac (and/or Linux)

  - by chris_l

  My printers don't support automatic duplex printing. I'm looking for a solution for my Mac and Linux computers that I've seen with most Windows printer drivers: Check "Manual duplex" in the printer screen Printer starts printing one side A dialog appears, asking me to flip the pages Printer prints the other side. One thing I can do, is print odd pages, then reopen the dialog and print even pages, but this is very inconvenient, especially when I only want to print a certain page range of the document as the Mac dialog forgets my previous page range every time. It gets even more inconvenient, when printing 2-up double sided, or when changing additional settings for this one printout. Is there maybe some tool, that can do this? Or maybe a "virtual printer driver" that can sit somewhere between the dialog and the actual printer driver, which manages these steps? (The Windows tool http://en.wikipedia.org/wiki/FinePrint can do something like that, but I don't need all of its features - and I need it on Mac/Linux) Thanks, Chris

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