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• Executing a command in vim from a commandline

  - by TK

  I would like to run :helptags ~/.vim/doc in vim, but from command line. The purpose is to run the command occasionally with other commands to keep my tools up-to-date (probably in a cron job on my development machine. I looked around man vim, but cannot figure out what option I need to pass. I think this is a general question for vim, but I'm using Mac and Ubuntu for the development.

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• Java, user input to the command line when using Runtime.getRuntime().exec(command);

  - by user1557354

  I dont think this is possible, but I have been using: Process p = Runtime.getRuntime().exec(command); to run commands on the command line, but now I have come accross a situation where the command I am running part way through will ask for some user input, for example a username. This can not be resolved by a argument to the command that is being exec, is there any way I can pass the username to the same command line instance and continue? Thanks in advance.

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• How do I send a file as an email attachment using Linux command line?

  - by Kit Roed

  I've created a script that runs every night on my Linux server that uses mysqldump to back up each of my MySQL databases to .sql files and packages them together as a compressed .tar file. The next step I want to accomplish is to send that tar file through email to a remote email server for safekeeping. I've been able to send the raw script in the body an email by piping the backup text file to mailx like so: $ cat mysqldbbackup.sql | mailx [email protected] cat echoes the backup file's text which is piped into the mailx program with the recipient's email address passed as an argument. While this accomplishes what I need, I think it could be one step better, Is there any way, using shell scripts or otherwise, to send the compressed .tar file to an outgoing email message as an attachment? This would beat having to deal with very long email messages which contain header data and often have word-wrapping issues etc.

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• Windows XP Network installation from Linux server ( RHEL 5)

  - by Kumar P

  How can i make network installation ( for install Windows XP ) from Linux ( RHEL 5 Server ) ? There is option in linux server to install client machine with linux by network installation. As same as windows server have option to install client machine with windows operating system. Now i want to know steps for linux server (RHEL5) to install client machine with windows operating system (Windows XP) *sorry for poor english

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• Linux Kernel Driver for video capture

  - by Stoopkid

  I have this EasyCap video capture thing with a USBTV007 chip and I really would like to get it working on my little linux mint 17 laptop so that I can capture video for my RC stuff. But I do not know what to do with this linux kernel driver. I don't even know how to get these files, I assume it is something like git. http://linuxtv.org/wiki/index.php/Easycap#USBTV007_EasyCAP I am looking for a beginner friendly explanation on what to do with this: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/media/usb/usbtv

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• Linux not picking up new partition correctly on emc pseudo device

  - by James

  Hi We have a database server running oracle rac. We were recently running out of space on the main LUN that it is attached to. I created a new 100GB LUN and concatenated this onto the existing LUN creating a new MetaLUN. After some messing I managed to get linux to recognise the new space. I then created a new partition in on the pseudo device, to use the new space. Previously when I have done this on other system the next step is to create an ASM disk on the new partition and add this disk to the oracle disk group. This however fails. I am aware of various issues with ASM and powerpath, but I don't think this is the issue here. As on while investigating the issue I discovered that one of the underlying logical device is not reflecting the size change. See below; Powermt displays all of the underlying logical units [root@XXXXX~]# powermt display dev=emcpowerd Pseudo name=emcpowerd CLARiiON ID=CKM00091500009 [VFRAC2] Logical device ID=6006016030312200787502866C65DE11 [LUN 30] state=alive; policy=CLAROpt; priority=0; queued-IOs=0 Owner: default=SP A, current=SP A Array failover mode: 1 ============================================================================== ---------------- Host --------------- - Stor - -- I/O Path - -- Stats --- ### HW Path I/O Paths Interf. Mode State Q-IOs Errors ============================================================================== 3 qla2xxx sde SP A0 active alive 0 0 3 qla2xxx sdj SP B0 active alive 0 0 4 qla2xxx sdo SP A1 active alive 0 0 4 qla2xxx sdt SP B1 active alive 0 0 Fdisk on the pseudo device shows correct space. [root@XXXXX ~]# fdisk -l /dev/emcpowerd Disk /dev/emcpowerd: 429.4 GB, 429496729600 bytes 255 heads, 63 sectors/track, 52216 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/emcpowerd1 1 39162 314568733+ 83 Linux /dev/emcpowerd2 39163 52216 104856255 83 Linux fdisk on one of the logical units is wrong [root@XXXXX~]# fdisk -l /dev/sde Disk /dev/sde: 322.1 GB, 322122547200 bytes 255 heads, 63 sectors/track, 39162 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sde1 1 39162 314568733+ 83 Linux /dev/sde2 39163 52216 104856255 83 Linux fdisk on the rest of the units is fine [root@XXXXX ~]# fdisk -l /dev/sdj Disk /dev/sdj: 429.4 GB, 429496729600 bytes 255 heads, 63 sectors/track, 52216 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdj1 1 39162 314568733+ 83 Linux /dev/sdj2 39163 52216 104856255 83 Linux Also when I created the the partition linux did not create the any entries in the /dev directory for the second partition so I created these manually [root@XXXXX dev]# mknod sde2 b 8 66 [root@XXXXX dev]# ls -al sd[ejot]? brw-r----- 1 root disk 8, 65 Dec 29 14:20 sde1 brw-r--r-- 1 root disk 8, 66 Apr 8 20:31 sde2 brw-r----- 1 root disk 8, 145 Dec 29 14:19 sdj1 brw-r--r-- 1 root disk 8, 146 Apr 8 20:33 sdj2 brw-r----- 1 root disk 8, 225 Apr 6 23:12 sdo1 brw-r--r-- 1 root disk 8, 226 Apr 8 20:33 sdo2 brw-r----- 1 root disk 65, 49 Dec 29 14:19 sdt1 brw-r--r-- 1 root disk 65, 50 Apr 8 20:33 sdt2 This is a production server that we cannot easily reboot. Any ideas would be much appreciated. J

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• Essential topics to be discussed in Linux 101

  - by zengr

  Hi, We are organizing a Linux 101 Workshop for undergrad and grad students. Can you share some ideas/topics that are must for people who are just starting with Linux. Preconditions: No knowledge of Linux OS, philosophy and technical aspects (kernel, shell, commands) Post conditions: A basic crash course of Linux which will give them a good start and answer some basic questions asked on it.

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• ARM Linux kernel debugging on AT91SAM9261

  - by agg

  I have ported Linux to AT91SAM9261 board, I have compiled my own Bootstrap, Uboot, Kernel and filesystem. Now I want to debug my Linux kernel 2.6.30 using KGDB and GDB. I have host with Ubuntu installed and target (AT91SAM9261) with kernel 2.6.30, I want to debug my Linux kernel 2.6.30 using serial/Ethernet. In KGDB official site they have given KGDB patch for x86, but not for ARM. Is it possible to debug my ARM linux kernel on AT91SAM9261?

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• Linux Device Driver: Symbol "memcpy" not found

  - by Hinton

  Hello, I'm trying to write a Linux device driver. I've got it to work really well, until I tried to use "memcpy". I don't even get a compiler error, when I "make" it just warns me: WARNING: "memcpy" [/root/homedir/sv/main.ko] undefined! OK and when I try to load via insmod, I get on the console: insmod: error inserting './main.ko': -1 Unknown symbol in module and on dmesg: main: Unknown symbol memcpy (err 0) I include the following: #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/init.h> #include <linux/kernel.h> /* printk() */ #include <linux/slab.h> /* kmalloc() */ #include <linux/fs.h> /* everything... */ #include <linux/errno.h> /* error codes */ #include <linux/types.h> /* size_t */ #include <linux/fcntl.h> /* O_ACCMODE */ #include <linux/cdev.h> #include <asm/system.h> /* cli(), *_flags */ #include <asm/uaccess.h> /* copy_*_user */ The function using memcpy: static int dc_copy_to_user(char __user *buf, size_t count, loff_t *f_pos, struct sv_data_dev *dev) { char data[MAX_KEYLEN]; size_t i = 0; /* Copy the bulk as long as there are 10 more bytes to copy */ while (i < (count + MAX_KEYLEN)) { memcpy(data, &dev->data[*f_pos + i], MAX_KEYLEN); ec_block(dev->key, data, MAX_KEYLEN); if (copy_to_user(&buf[i], data, MAX_KEYLEN)) { return -EFAULT; } i += MAX_KEYLEN; } return 0; } Could someone help me? I thought the thing was in linux/string.h, but I get the error just the same. I'm using kernel 2.6.37-rc1 (I'm doing in in user-mode-linux, which works only since 2.6.37-rc1). Any help is greatly appreciated. # Context dependent makefile that can be called directly and will invoke itself # through the kernel module building system. KERNELDIR=/usr/src/linux ifneq ($(KERNELRELEASE),) EXTRA_CFLAGS+=-I $(PWD) -ARCH=um obj-m := main.o else KERNELDIR ?= /lib/modules/$(shell uname -r)/build PWD = $(shell pwd) all: $(MAKE) V=1 ARCH=um -C $(KERNELDIR) M=$(PWD) modules clean: rm -rf Module.symvers .*.cmd *.ko .*.o *.o *.mod.c .tmp_versions *.order endif

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• what does "Net user administrator /active:yes" do to a computer?

  - by Rees

  i just purchased a new laptop and had some issues with it... I called tech support and they had me run this command in cmd prompt by right clicking the cmd icon and selecting "run as administrator" with root C:\windows\system32: "Net user administrator /active:no" after it was determined that it didn't fix the issue we ran this code "Net user administrator /active:yes" i then rebooted..and was asked for my windows login for my user account "Rees" as usual.. however ALL my settings where gone (including my desktop files) as though it was the first time I booted up. WHAT in the world happened with this command?? I desperately NEED my user accounts and files back to how they were!! (running windows 7) Please help!

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• Apple: Bind a key to a commandline command?

  - by Stefan Lasiewski

  I have a Mac Powerbook running Leopard (10.5.8). Does Leopard provide an easy way to bind keys to commands which are typically run on the commandline? For example, I can open up Terminal.app and run the command /System/Library/Frameworks/ScreenSaver.framework/Resources/ScreenSaverEngine.app/Contents/MacOS/ScreenSaverEngine which will activate the screensaver and lock my screen. What if I want to bind 'Apple-key L' to this command and execute this globally, regardless of which application is in use at the moment? Can I do this, or can I only run ScreenSaverEngine from a Terminal window? I tried to set up global keyboard shortcuts, but it seems that this won't allow me to bind a key to an arbitrary shell command: Note: You can create keyboard shortcuts only for existing menu commands. You cannot define keyboard shortcuts for general purpose tasks such as opening an application or switching between applications. I tried to set up a application keyboard shortcut, but commands like ScreenSaverEngine don't seem to be an application. Note that this Screensaver/Lock screen is just one example. I have come across other nifty commands which I might want to bind to a key-combination as well. I can do this in Gnome and Windows (with varying success). How about with Leopard?

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• Moving hidden files/folders with the command-line or batch-file

  - by Synetech

  Question Does anyone know of a way to move files and folders that have the hidden, system, or read-only attribute set from the command-line or a batch file? (No, stripping the attributes first is not an option since there is no practical way to know which attributes were set in order to re-set them after the move.) (Failed) Attempts Using the basic move command does not work with items with the hidden or system attribute set and for some reason, it does not have switches to specify attributes like the dir and del commands do. I tried using a utility I wrote that uses the shell’s file operation function, but that requires using start /w to prevent the batch file from running on ahead, and it complains about long-filename support for some reason. I tried using robocopy, but it first copies the files and then deletes the originals instead of simply moving the source (which results in a frustrating delay, even with the excessive output redirected to nul). (Surprisingly it seems that few people have ever needed to move hidden files from the command-line. All I could find was this one person who abandoned the attempt.)

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• Different behaviour when running exe from command prompt than in windows

  - by valoukh

  Forgive me if I'm not using the correct terminology here but I'll try to explain the issue I'm having as best I can! We use a program that allows you to view video footage from several cameras, and it works in such a way that when it is opened it then automatically loads several video files within its interface. These video files are stored in a subfolder, e.g. "videos\video1.asf", etc. I didn't create the program so I can't say what method it uses to open the files. The files are stored on a network server and are being accessed via a share/UNC path. When the file is run from windows explorer (by navigating to the network share and double-clicking the exe), it works perfectly. When the file is run via the (elevated) command prompt (e.g. by typing the \server\path\to\file.exe) it opens, but the corresponding video files do not load. I am trying to create a script that launches the program via the command prompt, so the first step is finding out why the two actions above have different consequences. Any advice on how running executables from the command prompt could produce a different result would be greatly appreciated. Thanks

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• Command prompt cannot find PATH variable

  - by davidXYZ

  Sometimes, my command prompt cannot find the PATH variable. I have this occasional problem at work where when I open command-prompt and run commands like ipconfig or subst, I get an error saying something like 'ipconfig' is not recognized as an internal or external command. When I try this echo %path%, it prints out %path% instead of the PATH value. If I look at my Environment Variables window, the PATH is defined right there but I don't know why CMD can't find it. At this point, I understand why the other commands were not being recognized since their paths are in PATH variable. However, I cannot understand why the PATH variable is not being found. If I restart the computer, everything is back to normal. In a few days, I might have the same experience again. I tried using this answer. It suggested changing a registry value but mine already had the value that was suggested yet it wasn't working. (The restart step at the end would have solved it as usual but that's not the point.) Any suggestions regarding why the PATH variable may become invisible every now and then and how I can prevent it from happening again?

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• 64-bit 13.10 shows 1GB less RAM than 64-bit 13.04 did

  - by kiloseven

  Multiple 64-bit versions (Kubuntu, Lubuntu and Xubuntu) once installed on my ThinkPad R60 show 3GB of RAM, not the correct 4GB of RAM. Last week with 13.04, I had 4GB of RAM (which matches the BIOS) and this week I have 3GB available. Inquiring minds want to know. Details follow: Linux R60 3.11.0-12-generic #19-Ubuntu SMP Wed Oct 9 16:20:46 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux r60 free -m reports: _ total used free shared buffers cached Mem: 3001 854 2146 0 22 486 -/+ buffers/cache: 346 2655 Swap: 0 0 0 . . . . . . lshw shows: description: Notebook product: 9459AT8 () vendor: LENOVO version: ThinkPad R60/R60i serial: redacted width: 64 bits capabilities: smbios-2.4 dmi-2.4 vsyscall32 configuration: administrator_password=disabled boot=normal chassis=notebook family=ThinkPad R60/R60i frontpanel_password=unknown keyboard_password=disabled power-on_password=disabled uuid=126E4001-48CA-11CB-9D53-B982AE0D1ABB *-core description: Motherboard product: 9459AT8 vendor: LENOVO physical id: 0 version: Not Available *-firmware description: BIOS vendor: LENOVO physical id: 0 version: 7CETC1WW (2.11 ) date: 01/09/2007 size: 144KiB capacity: 1984KiB capabilities: pci pcmcia pnp upgrade shadowing escd cdboot bootselect socketedrom edd acpi usb biosbootspecification {snip} *-memory description: System Memory physical id: 29 slot: System board or motherboard size: 4GiB *-bank:0 description: SODIMM DDR2 Synchronous physical id: 0 slot: DIMM 1 size: 2GiB width: 64 bits *-bank:1 description: SODIMM DDR2 Synchronous physical id: 1 slot: DIMM 2 size: 2GiB width: 64 bits dpkg -l linux-* returns: Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad) ||/ Name Version Description +++-======================================-=======================================-========================================================================== un linux-doc-3.2.0 (no description available) ii linux-firmware 1.79.6 Firmware for Linux kernel drivers ii linux-generic 3.2.0.52.62 Complete Generic Linux kernel un linux-headers (no description available) un linux-headers-3 (no description available) un linux-headers-3.0 (no description available) un linux-headers-3.2.0-23 (no description available) un linux-headers-3.2.0-23-generic (no description available) ii linux-headers-3.2.0-52 3.2.0-52.78 Header files related to Linux kernel version 3.2.0 ii linux-headers-3.2.0-52-generic 3.2.0-52.78 Linux kernel headers for version 3.2.0 on 64 bit x86 SMP ii linux-headers-generic 3.2.0.52.62 Generic Linux kernel headers un linux-image (no description available) un linux-image-3.0 (no description available) ii linux-image-3.2.0-52-generic 3.2.0-52.78 Linux kernel image for version 3.2.0 on 64 bit x86 SMP ii linux-image-generic 3.2.0.52.62 Generic Linux kernel image un linux-initramfs-tool (no description available) un linux-kernel-headers (no description available) un linux-kernel-log-daemon (no description available) ii linux-libc-dev 3.2.0-52.78 Linux Kernel Headers for development un linux-restricted-common (no description available) ii linux-sound-base 1.0.25+dfsg-0ubuntu1.1 base package for ALSA and OSS sound systems un linux-source-3.2.0 (no description available) un linux-tools (no description available)

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• How to use more than 3 virtual disks in Linux using CentOS and XenServer

  - by 010110110101

  I've attached 5 virtual disks to a Virtual Machine in Citrix XenServer. The VM has the xs-tools installed. Initially it said that it couldn't add so many disks. After I installed the xs-tools, it let me add all the disks. But /dev doesn't show all the disks. It shows these: /dev/xvda /dev/xvdb /dev/xvdc /dev/cdrom Perhaps it is bound by the limits of an IDE bus? (3 disks + CD-ROM) If so, how does one change the VM to use SCSI? Edit: According to the documentation: 2.6.3. VM Block Devices In the PV Linux case, block devices are passed through as PV devices. XenServer does not attempt to emulate SCSI or IDE, but instead provides a more suitable interface in the virtual environment in the form of xvd* devices. It is also possible to get an sd* device using the same mechanism, where the PV driver inside the VM takes over the SCSI device namespace. This is not desirable so it is best to use xvd* where possible for PV guests (this is the default for Debian and RHEL). For Windows or other fully virtualized guests, XenServer emulates an IDE bus in the form of an hd* device. When using Windows, installing the Citrix Tools for Virtual Machines installs a special PV driver that works in a similar way to Linux, except in the fully virtualized environment. Still, with 5 virtual disks attached, I don't see the other xvd devices. Edit #2: (attached requested info) Host Machine: XenServer 6.1 Linux version 2.6.32.43-0.4.1.xs1.6.10.777.170770xen (geeko@buildhost) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-51)) #1 SMP Wed Apr 17 05:52:03 EDT 2013 Guest Machine: CentOS release 6.4 (Final) Linux version 2.6.32-358.6.2.el6.x86_64 ([email protected]) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-3) (GCC) ) #1 SMP Thu May 16 20:59:36 UTC 2013 Output of 'fdisk -l' on Guest Machine: Note, the disk beyond the first 3 attached are not displaying -- there should be 4 100GB disks. (There are a total of 5 disks displayed in XenCenter -- 16GB, 100GB, 100GB, 100GB, 100GB) Disk /dev/xvdb: 107.4 GB, 107374182400 bytes 255 heads, 63 sectors/track, 13054 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xfb6c95b9 Device Boot Start End Blocks Id System /dev/xvdb1 1 13054 104856223+ 83 Linux Disk /dev/xvda: 17.2 GB, 17179869184 bytes 255 heads, 63 sectors/track, 2088 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000e5f41 Device Boot Start End Blocks Id System /dev/xvda1 * 1 64 512000 83 Linux Partition 1 does not end on cylinder boundary. /dev/xvda2 64 2089 16264192 8e Linux LVM Disk /dev/xvdc: 107.4 GB, 107374182400 bytes 255 heads, 63 sectors/track, 13054 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xed249ced Device Boot Start End Blocks Id System /dev/xvdc1 1 13054 104856223+ 83 Linux Disk /dev/mapper/vg_blue-lv_root: 14.6 GB, 14571012096 bytes 255 heads, 63 sectors/track, 1771 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/mapper/vg_blue-lv_swap: 2080 MB, 2080374784 bytes 255 heads, 63 sectors/track, 252 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 I see that the Linux versions say SMP. The Guest VM doesn't say "xen" in the name. However, I have already run yum install kernel-xen. Could be a clue?

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• Using the vim split command from the command line to get 4 quater splits

  - by sixtyfootersdude

  I want to open four vim files on the command line: vim file1 file2 file3 But I would like each file to be opened in a separate split: vim -c "split file1" -c "split file2" -c "split file3" file4 (The above splits the screen horizontally 4 times) Ideally what I would like to do is split the screen into 4 squares like: |-------|-------| | | | | | | |-------|-------| | | | | | | |-------|-------| I know how to do this once vim is open but I am unable to do this from the command line (using vs). Any ideas? Everything I try ends up looking like this (or a different variation): |-------|-------| | | | |-------| | | | | |-------| | | | | | | | |-------|-------|

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• How to understand Linux kernel source code for a beginner?

  - by Amit Chavan

  Hi, I am a student interested in working on Memory Management, particularly the page replacement component of the linux kernel. What are the different guides that can help me to begin understanding the kernel source? I have tried to read the book Understanding the Linux Virutal Memory Manager by Mel Gorman and Understanding the Linux Kernel by Cesati and Bovet, but they do not explain the flow of control through the code. They only end up explaining various data structures used and the work various functions perform. This makes the code more confusing. My project deals with tweaking the page replacement algorithm in a mainstream kernel and analyse its performance for a set of workloads. Is there a flavor of the linux kernel that would be easier to understand(if not the linux-2.6.xx kernel)?

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• Is there much difference between X86 Assembly language on Windows and Linux?

  - by Logan545

  I'm a complete beginner at Assembly, and my aim is to learn as much as I can to do with Assembly to one day I can reach expert level (I know I'm way off right now, but you never know). My only problem is this: I've got two books which both teach assembly, one on a Linux and the other on Windows. They are Jeff Duntemann's Assembly Language Step By Step (the linux one) and Introduction to 80x86 Assembly Language and Computer Architecture (the windows version). If I want to get the best out of assembly, should I do this on linux and windows? Also, is the syntax the same on Windows and Linux or will I have teach my self again when learning on the other OS( which is my main concern, I want to be able to use assembly on windows and linux).

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• How to understand Linux kernel source code for a beginner?

  - by user16867

  I am a student interested in working on Memory Management, particularly the page replacement component of the linux kernel. What are the different guides that can help me to begin understanding the kernel source? I have tried to read the book Understanding the Linux Virutal Memory Manager by Mel Gorman and Understanding the Linux Kernel by Cesati and Bovet, but they do not explain the flow of control through the code. They only end up explaining various data structures used and the work various functions perform. This makes the code more confusing. My project deals with tweaking the page replacement algorithm in a mainstream kernel and analyse its performance for a set of workloads. Is there a flavor of the linux kernel that would be easier to understand(if not the linux-2.6.xx kernel)?

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• How do you select the fastest mirror from the command line?

  - by Evan

  I want to update my sources.list file with the fastest server from the command line in a fresh Ubuntu Server install. I know this is trivially easy with the GUI, but there doesn't seem to be a simple way to do it from from the command line? There are two different working answers to this question below: Use apt-get's mirror: method This method asks the Ubuntu server for a list of mirrors near you based on your IP, and selects one of them. The easiest alternative, with the minor downside that sometimes the closest mirror may not be the fastest. Command-line foo using netselect Shows you how to use the netselect tool to find the fastest recently updated servers from you -- network-wise, not geographically. Use sed to replace mirrors in sources.list. The other answers, including the accepted answer, are no longer valid (for Ubuntu 11.04 and newer) because they recommended Debian packages such as netselect-apt and apt-spy which do not work with Ubuntu. Use sed to replace mirrors in sources.list sudo sed -i -e 's#us.archive.ubuntu.com/mirror.math.ucdavis.edu#g' /etc/apt/sources.list

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• Linux UML - Need gcc on the UML instance. Would like to mount gcc from hostfs

  - by Zach

  I know how to mount the hostfs directories when needed for my UML Linux instance. I need to get gcc and all it's dependencies from my host Linux instance by mounting the files in my UML instance. I think the paths are not working properly because it comes up with an error about cc1 and execvp when I mount all files and try to run gcc. Any ideas? Thanks!

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• GRE keepalive with Linux and RouterOS

  - by eri

  I have a Linux host and couple of routerboadrs. I created a GRE tunnel, but Linux does not answer keepalive packages. Then router mark gre connection as unreachable, so I cant send to Linux host from router subnet. If linux sends something into tunnel (ping, etc.) - RouterOS mark connection as reacheble. Second and next packages routed nicely until one minute idle (no traffic). Tunnel in linux a make in this way: remote=x.x.x.x dev=gre21 network=10.21.0.0/16 ip tunnel add ${dev} mode gre remote ${remote} ttl 255 ip addr add 172.16.1.1/24 peer 172.16.1.21 dev ${dev} ip link set ${dev} up ip route add ${network} dev ${dev} And ip l: 14: gre21: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1476 qdisc noqueue state UNKNOWN link/gre 0.0.0.0 peer 109.60.170.15 How to set state "running"? How to keep alive tunnel? Ping in cron?

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• How to use suse linux as a small router

  - by Mingo

  I has 2 subnet 192.168.1.0/24 and 192.168.2.0/24 and one suse linux, the linux has 2 interface, eth0 and eth1. I want to configurate the suse linux as a router so that make these 2 subnet can communicate with each other. This is my steps: 1.set the linux eth0 ip as 192.160.1.254,eth1 ip 192.168.2.254 2.add route in linux: route add -net 192.168.1.0 netmask 255.255.255.0 dev eth0 route add -net 192.168.2.0 netmask 255.255.255.0 dev eth1 3.set 192.168.1.0/24 gw as 192.168.1.254,and 192.168.2.0/24 gw as 192.168.2.254 I am not sure this will work or not? or some step i missing?

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• Untar after uploading to linux from windows

  - by Miqdad Ali

  I have created tar.gz from my linux server, and I downloaded the same to my linux system and I successfully doen untar with tar -xvf package.tar.gz. And now my issue I downloaded same package.tar.gz to the windows system then uploaded to another linux server, and tried same command tar -xvf package.tar.gz. but it getting tar: This does not look like a tar archive tar: Skipping to next header tar: Exiting with failure status due to previous errors as response. I also tried filezill manual trnasfer with binary mode. How can I do the same ? Update When I directly download to the linux system its working fine. When I downloaded to the windows system and try to extract with 7zip or winrar error is getting When I download to windows and upload to linux same error getting

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