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  • Prevent scp from copying local files?

    - by ashcatch
    I just read the Linux scp command issue question and it reminded me that I regularily forget to specify the colon in the host part of a scp command, and thus copying a file locally instead of copying to a remote host, e.g. I do scp foo host instead of scp foo host: But I never use scp to copy a file locally. So I wonder if there is a way to make scp fail if both (the source and destination) arguments refer to local files.

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  • Fast window switching without Alt-Tab or Command-Tab?

    - by Sridhar Ratnakumar
    Alt-Tab or Command-Tab can sometimes be slow, especially when you have many windows open and you frequently switch to only a few of those windows. How do you work around this problem -- any tool to switch to desired windows (most frequently accessed) directly, other than tapping the Alt-Tab combination multiple times? Note: This should work on Windows 7, Linux and Mac. Update: Please post your keyboard-shortcut solutions (using the mouse cannot be any faster - especially when you were touch-typing/writing-code before switching to a window).

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  • How to detect VPN disconnection with vpnc?

    - by Abhinav
    What is the easiest way to detect that a vpnc connection on Linux/Ubuntu has disconnected? Manually, I think the way to detect is to check whether the interface (tun0) appears in /sbin/ifconfig output. Is there a better way to find out immediately, so that a script can be run to restart the connection?

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  • How to avoid downtime when resizing virtual machines

    - by Ivan Buttinoni
    Many IaaS provider offer dynamic upgrade/downgrade of RAM and cores. Usually a Linux VM has to be rebooted to apply these changes. Sometimes, things like VMware tools or other guest services are well integrated so the upgrades to resources are immediately available, but the downgrades still need reboot. How can I solve this issue, so that when downgrading resources I do not have to reboot my guests?

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  • Use synergy with KVM

    - by Mr. Man
    I am using synergy on a Linux Mint server with a Mac as the client. I also have a physical KVM switch. The problem I have is that when ever I switch the physical KVM to my Mac, synergy stops working as in the keyboard and mouse don't work with the Mac. Thanks in advance!

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  • Tomcat shudown does not kill process

    - by vijay.shad
    Hi all, I have got some problems with my tomcat instance. I am using apache-tomcat-6.0.20 for linux.My OS is CENTOS when I execute command # bin/shutdown.sh It does not close the process that is running the tomcat. Can any body please give me some idea; what is happening with the process.

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  • VM Tuning to enhance performance

    - by Tiffany Walker
    vm.bdflush = 100 1200 128 512 15 5000 500 1884 2 vm.dirty_ratio = 20 vm.min_free_kbytes = 300000 That means that the MOST dirty data that can be in RAM is 20% and that there will always be 300MB RAM that linux CANNOT use to cache files right? What I am trying to do is ensure that there is always room left for service to spawn and use RAM. I have 8GB of ram and hosting websites with PHP so I want to have more free RAM on stand by instead of seeing myself on 50MB of RAM free.

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  • optimizing operating systems to provide maximum informix performance.

    - by Frank Developer
    Are there any Informix-specific guides for optimizing any operating system where an ifx engine is running? For example, in Linux, strip-down to a bare minimum all unecessary binaries, daemons, utilities, tune kernel parameters, optimize raw and cooked devices (hdparm). Someday, maybe, informix can create its own proprietary PICK-like O/S. The general idea is for the OS where ifx sits on have the smallest footprint, lowest overhead impact on ifx and provide optimized ifx performance.

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  • Can I extract a specific folder using tar to another folder?

    - by PeanutsMonkey
    I am new to the world of Linux and seem to have run into a stumbling block. I know I can extract a specifc archive using the command tar xvfz archivename.tar.gz sampledir/ however how can I extract sampledir/ to testdir/ rather than the path that the archive is in e.g.currently the archive is in the path /tmp/archivename.tar.gz and I would like to extract sampledir to testdir which is in the path /tmp/testdir.

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  • Debian 6 Server Enabling Remote Desktop [closed]

    - by Sampath
    I am currently running a web server on Debian 6 without a GUI. I connect to the server through SSH using putty from my Windows desktop. When managing Windows systems we use RDP to connect remotely, so how would I do the same for my Debian server? Note: I am not an linux power user. My Debian 6 server is a web server serving ruby on rails+mysql, so I would prefer a light weight remote desktop solution.

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  • Xserver that I can reconnect to

    - by depesz
    I'm looking for something like screen but for X? I imagine situation when I do something like "X --reconnect remote_server:11", and I am reconnected to pre-existing X session, with all programs that were running on it previously are still there. Is there anything like this? Platform: Linux.

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  • How can I set my computer up for remote SSH access?

    - by FarmBoy
    I have a Linux machine that I can access by SSH from my laptop when I am inside my house, but when I am using another Internet connection, I can't connect. What do I need to do? I have Verizon DSL Internet and an ActionTec modem, if that matters. If there are other relevant facts I'm omitting, please let me know and I'll improve my question.

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  • Why is setuid ignored on directories?

    - by Blacklight Shining
    On Linux systems, you can successfully chmod u+s $some_directory, but instead of forcing the ownership of new subdirectories and files to be the owner of the containing directory (and setting subdirectories u+s as well) as you might expect, the system just ignores the setuid bit. Subdirectories and files continue to inherit the UIDs of their creating processes, and subdirectories are not setuid by default. Why is setuid ignored on directories, and how can I get the system to recognize it?

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  • Check DHCP Option content

    - by Nathan Berviller
    Is it possible DHCP client check the contents of an option ? I need provisioning a Linux server with DHCP option 140 (option-140). But the server behaves as if the DHCP did not contain the information. In the file /var/lib/dhcp/dhclient.eth0.leases I do not see advanced DHCP options (option-140, option-141, option-142). How can I manually request the DHCP server to give me the contents of an option (to control the content) ? Bests Regards, Nathan

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  • Match Hard Disk Partition Table?

    - by MA1
    What is the most efficient way to match the partition tables on two different hard disks? I have saved the partition tables using dd command in linux. The partition tables are from a Windows system.

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  • Static build ffmpeg 0.8

    - by Riduidel
    Is there anywhere an available static build of ffmpeg with all encoder/decoders libs for Linux (not a source tarball, but a binary) ? Although this question seems trivial, I spent the last half hour looking for it, without any success. EDIT I'm looking for binary to be run on x86 Suse 10 systems. Notice I can't use local package manager as all update repositories have bene removed by admin (to avoid uncontrolled software update).

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  • Any online network topology to study?

    - by Gok Demir
    I want to study network. But I don't have an access to a sample network (routers, DNS, IP4, IP6 windows linux mixed heterogenous system). Do you know any online network to study (Free as possible). Is it possible to simulate network topologies with a sing PC using virtual machine. If so could you guide me?

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  • Page cache flushing behavior under heavy append load

    - by Bryce
    I'm trying to understand the behavior of the Linux pdflush daemon when: The page cache is initially pretty much empty There is a large amount of free memory The system starts undergoing heavy write load My understanding right now is that the vm.dirty_ratio and vm.dirty_background_ratio that control page cache flushing behavior are with respect to the present size of the page cache, which means that my writes will flush earlier than they would if the page cache was pre-populated (even with dummy data from some random file), and thus throughput will be lower. Is this accurate?

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