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• Restoring files from blueprint on command

  - by Nick

  I am setting up a server. I already have rented a machine running centOS 6 but I have run into a bit of a technical problem with configuring the server software: The server will have some files that it will try to read/write to them but what I need is a way to have a blueprint of these files and everytime the server restarts the files that it used get deleted and replaced by the blueprints. I have heared of a RAM disks or Virtual File Systems but didnt quite understand how they work or how to set them up. The server software is written in java which means bash commands can be run from it. I cannot modify what happens when the server shuts down entirely what I can do is run a command before the server runs the final shutdown save

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• which command run in cron returns nothing

  - by Zárate

  Hi there, I've written a little utility in haXe + Neko that needs to execute some GIT commands. To avoid hardcoding the path to the GIT executable I'd like to use the which command to find out where it is. Everything works as expected when running manually from the console, but not when the the app runs on a cron job. I'm aware of the restricted environment (here or here) when you run a script using cron, but still surprised this doesn't work: /usr/bin/which git >> /home/user/git.txt The text file is created but the content is empty. Again, when run from the console it works as expected. Any ideas? I'm running OS X Leopard, if that helps. Thanks : ) Juan

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• The 'which' command returns nothing via cron, but works via console

  - by Zárate

  Hi there, I've written a little utility in haXe + Neko that needs to execute some GIT commands. To avoid hardcoding the path to the GIT executable I'd like to use the which command to find out where it is. Everything works as expected when running manually from the console, but not when the the app runs on a cron job. I'm aware of the restricted environment (here or here) when you run a script using cron, but still surprised this doesn't work: /usr/bin/which git >> /home/user/git.txt The text file is created but the content is empty. Again, when run from the console it works as expected. Any ideas? I'm running OS X Leopard, if that helps. Thanks : ) Juan

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• Delete recursive directorys with FTP command on Bash

  - by Fake4d

  I have a problem with my infrastructure here. I am in a closed DMZ and have to access a FTP-Server in another DMZ from a headless Suse Linux 10.1. So i think i only got the ftp command.. But i have to delete a directory with about 100 subdirectorys and endless files in it.. When I type del directory it returns "Its not empty" and so i have to delete each sub directory and file manually. Oh please tell me a way how i can do this automatically :)

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• kernel warning disk error for command write - solaris svm

  - by help_me

  Recently this warning came up on my message logs, scsi: [ID 107833 kern.warning] WARNING: /pci@1c,600000/scsi@2/sd@0,0 (sd0): Oct 27 00:14:44 Error for Command: write(10) Error Level:Retryable Oct 27 00:14:44 scsi: [ID 107833 kern.notice] Requested Block: 101515828 Error Block: 101515828 Oct 27 00:14:44 scsi: [ID 107833 kern.notice] Vendor: SEAGATE Serial Number: 0441B9B5H Oct 27 00:14:44 scsi: [ID 107833 kern.notice] Sense Key: Hardware Error Oct 27 00:14:44 scsi: [ID 107833 kern.notice] ASC: 0x19 (defect list error), ASCQ: 0x0, FRU: 0x2 This is showing signs of disk failing in my opinion. I have not seen the messages re-occurring. This is on a Solaris 9 Sparc system V240. The disks are managed by SVM and "metadb" is showing the flags as "a" Are there any tests or indications as to check/see if the disk is actually failing or was that error message initiated by something else. Thank you!

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• Issue with Visual C++ 2010 (Express) External Tools command

  - by espais

  Hi all, Normally we develop in VS 2005 Pro, but I wanted to give VS 2010 a spin. We have custom build tools based off of GNU make tools that are called when creating an executable. This is the error that I see whenever I call my external tool: ...\gnu\make.exe): *** couldn't commit memory for cygwin heap, Win32 error 487 The caveat is that it still works perfectly fine in VS2005, as well as being called straight from the command line. Also, my external tool is setup exactly the same as in VS 2005. Is there some setting somewhere that could cause this error to be thrown?

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• Run shell command with variable in filename via Python

  - by rajitha

  I have files with naming convention st009_out.abc1.dat st009_out.abc2.dat st009_out.abc3.dat .................. .................. I am writing Python code where I want to use data from the file to perform a math function and need to extract the second column from the file. I have tried it this way: for k in range(1,10): file1=open('st009_out.abc'+str(k)+'.dat','r') ........... os.system("awk '{print $2}' st009_out.abc${k}.pmf > raj.dat") but this is not working as it is not taking the value of k in the shell command. How do I progress?

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• Bash: Quotes getting stripped when a command is passed as argument to a function

  - by Shoaibi

  I am trying to implement a dry run kind of mechanism for my script and facing the issue of quotes getting stripped off when a command is passed as an argument to a function and resulting in unexpected behavior. dry_run () { echo "$@" #printf '%q ' "$@" if [ "$DRY_RUN" ]; then return 0 fi "$@" } email_admin() { echo " Emailing admin" dry_run su - $target_username -c "cd $GIT_WORK_TREE && git log -1 -p|mail -s '$mail_subject' $admin_email" echo " Emailed" } Output is: su - webuser1 -c cd /home/webuser1/public_html && git log -1 -p|mail -s 'Git deployment on webuser1' [email protected] Expected: su - webuser1 -c "cd /home/webuser1/public_html && git log -1 -p|mail -s 'Git deployment on webuser1' [email protected]" With printf enabled instead of echo: su - webuser1 -c cd\ /home/webuser1/public_html\ \&\&\ git\ log\ -1\ -p\|mail\ -s\ \'Git\ deployment\ on\ webuser1\'\ [email protected] Result: su: invalid option -- 1 That shouldn't be the case if quotes remained where they were inserted. I have also tried using "eval", not much difference. If i remove the dry_run call in email_admin and then run script, it work great.

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• Command to determine whether ZooKeeper Server is Leader or Follower

  - by utrecht

  Introduction A ZooKeeper Quorum consisting of three ZooKeeper servers has been created. The zoo.cfg located on all three ZooKeeper servers looks as follows: maxClientCnxns=50 # The number of milliseconds of each tick tickTime=2000 # The number of ticks that the initial # synchronization phase can take initLimit=10 # The number of ticks that can pass between # sending a request and getting an acknowledgement syncLimit=5 # the directory where the snapshot is stored. dataDir=/var/lib/zookeeper # the port at which the clients will connect clientPort=2181 server.1=ip1:2888:3888 server.2=ip2:2888:3888 server.3=ip3:2888:3888 It is clear that one of the three ZooKeeper servers will become the Leader and the others Followers. If the Leader ZooKeeper server has been shutdown the Leader election will start again. The aim is to check if another ZooKeeper server will become the Leader if the Leader server has been shut down. Question Which command needs to be issued to check whether a ZooKeeper server is a Leader or a Follower?

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• Advanced command line editing for Windows?

  - by Ben Collins

  I'm developer who was "born and bred" on Linux and BSD systems, and I've become accustomed to having advanced tools for the console (posix shells like bash, for example). My career has taken a twist that means I'm working in a Windows environment most of the time, and the console capabilities are really poor by comparison. The traditional windows console environment is a complete joke, and even most of the third party attempts at improving things aren't a lot better. PowerShell is a huge step in the right direction, but the console applications themselves are still way behind where unix has been for 20 years. Does anyone know of a PowerShell console application that supports advanced command line editing like posix shells do? I'm particularly interested in emacs-mode editing, and I'd also like to be able to resize my window to an arbirary size, unlike the native console app that comes with Windows.

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• How do I add permissions via command line for "everyone" on external HDD

  - by acidzombie24

  I have an external HDD and I kind of messed up the file permissions but when fixing it I thought it is ok bc with my username I can access the files perfectly fine. Now that I use this with two PC (actually ATM I don't have access to my other PC) I can't access these files. The problem is this directory has hundreds of folders with no permission for "everyone". I would like to give it the default permissions including have all access for the user "everyone". How do I do that via command line for these hundreds of folders?

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• Invalid command 'VirtualDocumentRoot'

  - by andy

  I'm unsure as to why I'm getting the following error when apache is rebooted: Invalid command 'VirtualDocumentRoot', perhaps misspelled or defined by a module not included in the server configuration Action 'start' failed. The snippet it is referring to is this: <VirtualHost *:80> ServerAdmin [email protected] VirtualDocumentRoot /local/www/staging/%1 ServerAlias *.staging.mydomain.com </VirtualHost> I assumed it was a misspelling as it said, but it was copied directly from another server of mine. It works perfect there. Any ideas?

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• Privileged command as part of cronjob

  - by user42756

  Hi, I'm facing a weired problem on a unix-based machine. Here is the story: I have a personal username/password on a unix machine with limited privileges. Whenever I need to execute some commands I have to substitute user using the su command, then I execute it normally. Now, I need to add a cronjob that uses such privileged commands so I added the cronjob on the crontab of the user I substituted to in order to have access to these commands. Strangely, it turned out to me that these commands fail to run for some reason as a cronjob although when I execute them directly from shell (after su) they work seamlessly. Why does this happen? Why do these commands not work as part of cronjobs? Thank you

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• How to update OpenSSL using Putty and yum command

  - by JM4

  I am so new to updating server technologies it is unbelievable but we are trying to become PCI Compliant and have to update some of our server technologies. One in particular is OpenSSL. We are currently running arch i686 0.9.8e but we have to upgrade to ATLEAST 0.9.8g. When I run a yum update command, there are no updates available. If I run "yum info openssl" it says available packages are: arch i386 0.9.8e but the only difference is smaller file size. I am running the following repositories: Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * addons: mirrors.netdna.com * atomic: www6.atomicorp.com * base: mirrors.igsobe.com * extras: mirror.vcu.edu * updates: mirror.vcu.edu any help out there?

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• Server responses "bus error" to every command

  - by Temnovit

  I have a linux machine dedicated to MySQL server with a pretty high load. Today I woke up and was terrified to see, that database server is down. I could connect to it via SSH, but it was responding with bus error to each and every command. [root@r1304 home]# ls Bus error [root@r1304 home]# tail /var/log/messages Bus error [root@r1304 home]# reboot Bus error [root@r1304 home]# free -m Bus error [root@r1304 home]# chkdisk Bus error I went to Data Center and did a hard reset, which seemed to help, but after a half an hour situation reapeated and now I can't even connet via SSH anymore. Any ideas what this could be? how to diagnose such a problem and what are possible fixes? Server has 32 GB RAM, 2xSSD drives with software RAID UPDATE According to Zabbix, when MySQL died, number of processes stated to increase drammaticaly, until I did a hard reset. What could those be? Number of processes

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• Would shell command join cause out of memory?

  - by Hancy

  I have two file to join. FILE 1: a A1 a A2 a A3 ... c C1 c C2 ... FILE 2: a feature1_of_a a feature2_of_a ... a featureN_of_a ... ... c feature1_of_c c feature2_of_c ... after join, i could get File like this: A1 feature1_of_a A2 feature1_of_a A3 feature1_of_a A1 feature2_of_a A2 feature2_of_a A3 feature2_of_a ... A1 featureN_of_a A2 featureN_of_a A3 featureN_of_a ... In order to do that: i wrote shell command join -11 -21 -o1.2,2.2 file1 file2. But the problem is: number N might be huge. So if join read all feautre of a into memory at once, memory might not be enough. I don't know how join is implemented. WQould the momery become a problem? If so, is there any way to get what I want?

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• Command output as string

  - by rik

  I want to get output from command C:\Program Files (x86)\Java\jre7\bin\java.exe" -version as string variable. I tried this way: $out = &"C:\Program Files (x86)\Java\jre7\bin\java.exe" -version but it gives error message: java.exe : java version "1.7.0_05" At line:1 char:9 + $out = & <<<< "C:\Program Files (x86)\Java\jre7\bin\java.exe" -version + CategoryInfo : NotSpecified: (java version "1.7.0_05":String) [], RemoteException + FullyQualifiedErrorId : NativeCommandError Java(TM) SE Runtime Environment (build 1.7.0_05-b05) Java HotSpot(TM) Client VM (build 23.1-b03, mixed mode, sharing) $out variable seems empty. What am I doing wrong?

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• Using openssl command line tool to encrypt/decrypt data, DES ECB

  - by smsrecv

  Hello How can I create a random 64 bit key for DEC ECB encryption/decryption, and then use the same key for encryption/decryption many times? All this must be done using openssl command line tool. In all the examples I have seen, they do not use a "key", they use "password". But I need a key - array of bytes - because I need to send it to the other party (I don't know which API they use for cryptography.) Then I need to use this key - array of bytes - to encrypt/decrypt data. Thnak you

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• Log into AD account through Command Line

  - by CranialPain

  Our SBS2003 server likes to lose connection every so often. This appears to 'kick' everyone out, so that no-one can access the server or its shared folders without a log off log in. It usually brings up an error message stating that Windows 7 (on the client machines) cannot find the server, even though its ping-able. Is there a way to login through the command line so I can just write a batch file and have the users double-click it and enter their credentials instead of closing down programs and logging out/in over and over?

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• file:// command-line arguments

  - by Cory Grimster

  Is it possible to pass command-line arguments to a program that is invoked via a file:// url? I'm trying to include Remote Desktop links in a wiki page that lists some servers: <a href="file:///c|/windows/system32/mstsc.exe /v:serverName">serverName</a> When I omit the argument the link works fine, but when I include it the link doesn't work. I Googled around a bit and couldn't find any references to this. I suspect that the answer is that file:// urls simple don't accept arguments (I can think of all kinds of ways to abuse them if they do), but I thought I'd throw it out there in case I've simply got the syntax wrong. Thanks.

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• -w test on OS X gives command not found error

  - by RobV

  I'm writing a bash script which I'm testing on OS X though it will ultimately run on a standard Linux environment and running into a weird error. I have tests like this in my script: if [ ! -w $BP ]; then echo "'$1' not writable" exit 1 fi Which seems pretty sane to me and works fine under Linux but when trying to test on OS X I get the following error message: startSvr.sh: line 135: [: missing `]' startSvr.sh: line 135: -w: command not found So is this a case of OS X not supporting the -w test or is there some other reason this isn't working for me? e.g. environment

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• Mutt: apply command to all tagged messages

  - by mrucci

  From the mutt manual: Once you have tagged the desired messages, you can use the tag-prefix operator, which is the ; (semicolon) key by default. When the tag-prefix operator is used, the next operation will be applied to all tagged messages if that operation can be used in that manner. But it seems that I can only execute commands that are already bound to a specific keyboard shortcut. For example I can use ;d to delete all selected messages. What if I want to apply an "unbound" command (such as purge-message)? I have also tried using something based on :exec tag-prefix or :push tag-prefix without success.

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• Launching multiple applications with a single command/script/shortcut

  - by Bill

  I realized a few days ago that every time I sit down at work, I do a few things after unlocking my computer. First, I open up Firefox, then I open up Chrome, then I log in to Digsby. I realized I could probably save repeating this daily by writing a small batch script to open up Firefox and Chrome , but I couldn't figure out how to make it work.. and since the whole effort is to save time I don't want to bash my head around in the windows command prompt to do it. I also tired this in powershell but ran in to a bunch of security nonsense. Is there a way to do this that I am missing? Bonus points if somebody has figured out how to manipulate Digsby via COM , scripting, or python =)

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• Custom command in right-click menu not working

  - by Luke

  I have added, via the registry, a right click menu option for all filetypes which is supposed to get the MD5 checksum for a file. HKEY_CLASSES_ROOT*\shell\Checksum - Default: Get Checksum and HKEY_CLASSES_ROOT*\shell\Checksum\command - Default: checksum.cmd "%1" checksum.cmd simply clears the screen, calls fciv.exe using %1 and then pauses. Unfortunately, whilst the option "Get Checksum" appears correctly in the right click menu, it doesn't perform the right action when clicked. When I click it an "Open With" dialog opens, which is of course not what I want. Both checksum.cmd and fciv.exe are in the PATH. checksum.cmd: @echo off cls fciv.exe %1 pause Anybody know what's going on?

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• Numpad's Enter key is acting like the Command key instead

  - by user19294

  I can't get the numpad Enter key to work on OS X 10.6.5. The numpad works fine, as do the plus and minus keys. Only the Enter is not working. I tried 2 keyboards and I get the same problem with both, so it's got to be a setting somewhere. In Keyboard Viewer, when I press the key, it shows that the ? keys are pressed. And indeed, pressing Enter-L puts the cursor in the location bar of my browser, just like Command-L would. Is there a way to remap it?

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