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  • Is there a compression method for compressing a group of very similar files, without archiving them?

    - by awiebe
    I want to compress a large nuber of files that have near identical headers, and also some data, however I do not wish to archive them, nor do I wish to zip them individually(because the copression ratio would be much higher if substitutions of similar blocks could be done using a single table). Does a compression method exist to do this already, or should I implement it myself. Note: Don't say "Disk space is cheap", because I may want to use this on an embedded system.

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  • Run a local script on a remote server using ssh with out having to worry about quotes

    - by Michael Irey
    So I have been running local scripts fine on a remote server: ssh user@server '`cat local-script.sh`' However, today I have a script that has both single and double quotes in it. Which causes the script to fail because the output of cat local-script.sh is wrapped in quotes. With out modifying the script itself, is there a better way to handle this? I thought this may work: ssh user@server $(<local-script.sh) But is does not seem to do anything...

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  • How to install Ubuntu, Windows XP and Windows 7 from scratch as triple-boot system

    - by simon
    I'm currently running Windows XP, but have ordered Windows 7. I want to keep Windows XP on a separate partition, and install Ubuntu as well. In which order should I install the OSs, and is there anything differing from an ordinary single-system install I should keep in mind? For example, does the order of partition make any difference? If I want to have the system drive as "C:" drive in both Win XP and Win 7, what should I do?

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  • Bash Shell Scripting - How to iterate through directories, and copy and rename files?

    - by Cypher
    I have a directory setup as follows: /hosted/partner1/logo.png /hosted/partner2/logo.png /hosted/partner3/logo.png /hosted/partner4/logo.png /hosted/partner5/logo.png ..etc. I want to write a script that can COPY those files to a different location, with a different file name, like this: /partners/partner1.png /partners/partner2.png /partners/partner3.png ..etc. Any ideas? I'm not so great with shell scripting and there are a lot of files that I need to migrate to a single directory...

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  • Switch flooding when bonding interfaces in Linux

    - by John Philips
    +--------+ | Host A | +----+---+ | eth0 (AA:AA:AA:AA:AA:AA) | | +----+-----+ | Switch 1 | (layer2/3) +----+-----+ | +----+-----+ | Switch 2 | +----+-----+ | +----------+----------+ +-------------------------+ Switch 3 +-------------------------+ | +----+-----------+----+ | | | | | | | | | | eth0 (B0:B0:B0:B0:B0:B0) | | eth4 (B4:B4:B4:B4:B4:B4) | | +----+-----------+----+ | | | Host B | | | +----+-----------+----+ | | eth1 (B1:B1:B1:B1:B1:B1) | | eth5 (B5:B5:B5:B5:B5:B5) | | | | | | | | | +------------------------------+ +------------------------------+ Topology overview Host A has a single NIC. Host B has four NICs which are bonded using the balance-alb mode. Both hosts run RHEL 6.0, and both are on the same IPv4 subnet. Traffic analysis Host A is sending data to Host B using some SQL database application. Traffic from Host A to Host B: The source int/MAC is eth0/AA:AA:AA:AA:AA:AA, the destination int/MAC is eth5/B5:B5:B5:B5:B5:B5. Traffic from Host B to Host A: The source int/MAC is eth0/B0:B0:B0:B0:B0:B0, the destination int/MAC is eth0/AA:AA:AA:AA:AA:AA. Once the TCP connection has been established, Host B sends no further frames out eth5. The MAC address of eth5 expires from the bridge tables of both Switch 1 & Switch 2. Switch 1 continues to receive frames from Host A which are destined for B5:B5:B5:B5:B5:B5. Because Switch 1 and Switch 2 no longer have bridge table entries for B5:B5:B5:B5:B5:B5, they flood the frames out all ports on the same VLAN (except for the one it came in on, of course). Reproduce If you ping Host B from a workstation which is connected to either Switch 1 or 2, B5:B5:B5:B5:B5:B5 re-enters the bridge tables and the flooding stops. After five minutes (the default bridge table timeout), flooding resumes. Question It is clear that on Host B, frames arrive on eth5 and exit out eth0. This seems ok as that's what the Linux bonding algorithm is designed to do - balance incoming and outgoing traffic. But since the switch stops receiving frames with the source MAC of eth5, it gets timed out of the bridge table, resulting in flooding. Is this normal? Why aren't any more frames originating from eth5? Is it because there is simply no other traffic going on (the only connection is a single large data transfer from Host A)? I've researched this for a long time and haven't found an answer. Documentation states that no switch changes are necessary when using mode 6 of the Linux interface bonding (balance-alb). Is this behavior occurring because Host B doesn't send any further packets out of eth5, whereas in normal circumstances it's expected that it would? One solution is to setup a cron job which pings Host B to keep the bridge table entries from timing out, but that seems like a dirty hack.

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  • How do you test a new email filtering system?

    - by Zoredache
    What method do you use to test or evaluate potential new email filtering systems before you set it up on your production network? I am particularly interested in methods that are appropriate for small/medium sized organizations with a single mail server without the resources to build a duplicate of their email system.

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  • Computer powers on automatically and beeps, but no display

    - by SomeOne
    I have a problem with my computer turning on automatically. The power switch lights up and the fan keeps running. After a while, a single beep will be heard every minute or so but nothing will display on the monitor. In some cases it will completely turn on and suddenly shut off. What is the problem and how can I fix it? This is a desktop computer running Windows XP.

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  • Does using a tiling window manager make a terminal multiplexer obsolete?

    - by Jan Westerdiep
    Since about half a year I have been enjoying a terminal multiplexer (tmux, to whomever it may concern), and have grown to like it. I would like to try a tiling WM as opposed to a stacked one some time in the future but cannot wrap my head around this simple question: Why would one use the splits in a multiplexer within a tiling WM? Is there an upside, besides of course the single instance you'd be running?

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  • What's the easiest way to 'cat' groups of files together?

    - by rajitha
    I have files with naming convention of this pattern: bond_7.LEU.CA.1.dat bond_7.LEU.CA.2.dat bond_7.LEU.CA.3.dat bond_12.ALA.CB.1.dat bond_12.ALA.CB.2.dat bond_12.ALA.CB.3.dat ... I want to concatenate all files of the same group into a single one. For example: cat bond_7.LEU.CA.*.dat > ../bondvalues/bond_7.LEU.CA.1_3.dat There's large number of these files. How can achieve this with a bash script?

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  • killing all instances of chrome on the command line?

    - by Fedor
    In some cases killing a single tab/process doesn't do it and I need to close Chrome entirely. Since Chrome has multiple processes, how can I close all of them at once? I know that... pgrep chrome returns all the pids, can someone tell me a trick that would allow me to close all of them by feeding them to another command or merging them to a csv or something?

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  • script to su with password in script without root

    - by Triplell89
    I have scripted a process that involves updating symbolic links on files located on 3 different machines. On those machines exists 4 users each, who each need to have these links updated. Using su, is there a way to pass the password argument to the command on a single line, without invoking sudo as the users will not have admin rights? My only alternative solution at this point is to ssh around, however I would like to be able to do this without hardcoding in a bunch of hosts/ips.

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  • Is a local account OK for TFSREPORTS in TFS 2010?

    - by Edward Brey
    When installing a single-server TFS 2010 installation into a Windows Server 2008 R2 installation on a domain, a user account is required for TFSREPORTS and WSSSERVICE (which share the same account by default). Is there any value in using a domain account or would a local account on that computer (not a built-in account) work just as well?

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  • Office 2007 Calendar Overlays - Combine meetings that everybody shares

    - by Macho Matt
    I want to display approximately 10 people's calendar in Outlook 2007 using overlays. The problem is that they all share the same meeting a couple of times a week. Thus, I see that show up 10 times on a single day, which compresses what is actually displayed. Since they are all at the same meeting(s), it would be nice to have them just display once. Is this built into Office 2007?

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  • Which is a better use of my SSD Drive [on hold]

    - by RS Conley
    I have the choice of setting up a system with two SSD Drives in Raid 1 mode as my boot drive for Windows 7 64-bit. With the Program Files and User Folders moved to a Second regular HD Drive also configured using Raid 1. Or Setup a single SSD Drive (120 GB or 256 gb) as a cache Drive using Intel Rapid Storage Technology combined with two normal hard drives configured as Raid 1. Which setup would have the faster hard drive performance over the life of the computer?

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  • Question about RewriteRule and HTTP_HOST server variable

    - by SeancoJr
    In evaluating a rewrite rule that redirects to a specific URL and say the rewrite condition is met, would it be possible to use HTTP_HOST as part of the URL to be redirected to? Example in question: RewriteRule .*\.(jpg|jpe?g|gif|png|bmp)$ http://%{HTTP_HOST}/no-leech.jpg [R,NC] The motive behind this question is a desire to create a single htaccess file that would match against an addon domain (on a shared hosting account) and an infinite amount of subdomains below it to prevent hotlinking of images.

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  • Using Ubuntu switch a failing windows 7 harddrive?

    - by firefusion
    My laptop harddrive has developed some serious read errors in the windows partition. Windows 7 still boots but every single action takes an aeon, and it is definitely due to a harddisk error not due to any spyware. I'm using the Ubuntu partition now. I've ordered a new harddrive but my laptop didn't come with a Windows 7 install disk (I think I was meant to make one with the windows 7 tools). So how can I install Windows 7 on my new harddrive?

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  • Video File Format Converter

    - by Auxi
    Is there any single application that convert all the following video file formats (3g2, 3gp, 3gp2, 3gpp, 3p, asf, avi, divx, dv, dvx, flv, gif, moov, mov, mp4, mpeg4, mpg4, mpe, mpeg, mpg, qt,  wmv, xvid) to Flv?

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  • Update MS Windows XP via batch script

    - by oshirowanen
    Is it possible to update WXP using a batch script? Basically, I would like to run a batch script, which installs all important updates in the background accepting any dialog boxes which need user interaction. EDIT 1: I know I can enable the "Automatically download and install" option to do this, but I have about 100 computers to do, so it would be nice if it can be done via a batch file. That way, I can use the software we already have to run a batch file on all computers with a single click.

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  • What are the reasons to marry a carrier?

    - by Bohdan Trotsenko
    Probably because I live in Europe, I cannot understand 1 phenomenon in US cellphones business. iPhone is bound to AT&T, HTC EVO 4G is for Sprint, Droid goes with Verison etc... Businesses do that. I guess they do that for a reason. If I were a phone manufacturer, why should I make a phone available for a single carrier only?

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