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• How to delete files on the command line with regular expressions?

  - by Jack

  Lets say I have 20 files named FOOXX, where XX is the number of the file, eg 01, 02 etc. At the moment, if I want to delete all files lower than the number 10, this is easy and I just use a wildcard, eg rm FOO0* However, if I want to delete specific files ina range, eg 13-15, this becomes more difficult. rm FPP[13-15] does not work, and asks me if I wish to delete all files. Likewse rm FOO1[3-5] wishes to delete all files that begin with FOO1 So, what is the best way to delete ranges of files like this? I have tried with both bash and zsh, and I don't think they differ so much for such a basic task?

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• Terminal Server 2003 Performance Troubleshooting

  - by MikeM

  Let me get your thoughts on terminal server performance problems. The server hosts average 25 users which, after running some numbers, on average use 600MB memory with their main applications running (web browser, adobe reader, IP phone client). All users are on the same LAN as server. We constantly experience slow response and short session lockups. Combined CPU usage is on average 10%. What appears strange to me is that the system shows 29GB physical memory with 25GB of it free. The page file usage is about 50% averaging 9GB used. Some server specs OS: Server 2003 32bit Enterprise with /PAE flag RAM: 32GB CPU: 2xQuad Core @ 2.27Ghz HD: RAID5 1.2GB After doing basic troubleshooting using performance monitor it leads me to believe that the performance problems are caused by the 32bit OS limitation in addressing full 32GB of physical memory even though the /PAE flag is used. Can anyone suggest something, troubleshooting steps that can lead to a more conclusive answer? Thanks

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• Connecting office to data center via Metro-ethernet

  - by Eric

  I am installing a metro ethernet link from my office to my data center. The office will have a cisco 3750 with several vlans. The data center end will have a more complicated set up. The metro e from the office will connect to a 2960, which will have two other 2960s with a few vlans and a 2811 router connected to it for connectivity to our other environments and the internet. I am looking at implementing this by connecting the office 3750 and the data center 2960 with a dot1q trunk and doing all routing at the 2811. I will configure subinterfaces for gateways for each of the vlans on the 2811. I work for a small company and don't have much of a budget for an ideal architecture. I can post a simple diagram if needed for clarification. Is there anything I am missing here? I feel like I am forgetting something very basic and want to make sure I eliminate any boneheaded mistakes.

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• estimating size of reply HTTP headers

  - by Guanidene

  I am trying to download a file via a basic socket connection, using a HTTP GET request. So, I have to specify how many bytes of data coming in I have to read from the socket. However, I am having trouble deciding the amount of data (say, in bytes) the server would reply back with. I know that there is a "Content-Length" field in the reply sent by server, but that gives me the size of the actual data (without the http headers). Is there a way to get the exact size of HTTP headers sent by the server or an estimation is required? (I am doing this for downloading on a mobile network, where every bit of data matters in terms of time and money, so I don't wish to make an unnecessary larger estimate of the header size.)

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• YUM and RPM crash due to the liblua-5.1 library being missing

  - by A troubled linux newbie.

  I've been playing around with a LiveUsb install of basic Fedora with persistence. I attempted to install moonscript, which requires Lua and LuaRocks. After installing Lua and discovering there were flaws in the install which prevented LuaRocks from working, I used rpm to force Lua off so I could use yum to re-install it. The result was an error of this sort being yielded by both rpm and yum: There was a problem importing one of the Python modules required to run yum. The error leading to this problem was: liblua-5.1.so: cannot open shared object file: No such file or directory I've concluded from this that my Lua version installed a library which both yum and rpm are now connected to. Is there anyway to fix this without reformatting my drive and installing everything from scratch?

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• Extremely slow startup of tomcat

  - by Henrik

  I have a tomcat 7 installation on a Solaris 10 server. My problem is that starting the server (or deploying a new war) is extremely slow. It usually take 30 - 60 minutes. The war application is a medium sized grails application so there are quite a a lot of files. The server is running other server applications as well but from my basic skills I don't see this as a problem. Can anyone give me some tips on how to analyse this? Settings in Tomcat, java, server, disc access or something else? I use these parameters to tomcat: CATALINA_OPTS="-Dcom.sun.management.jmxremote=true -Djava.awt.headless=true -Dfile.encoding=UTF-8 -server -Xms1536m -Xmx1536m -XX:NewSize=256m -XX:MaxNewSize=256m -XX:PermSize=512m -XX:MaxPermSize=512m -XX:+DisableExplicitGC" And I use a 32 bit java 1.6.

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• Wake up my company computer from a home computer

  - by Darcy

  I would like to learn if it is possible for me to send a packet (a magical one) from another computer to my computer. I am interested in waking up my computer at work from the one I am using at home. That is I would like to power it on at 7:00am by sending it a wake-on packet from the home computer. I have no idea how to carry out this seemingly trivial task, I hope someone could offer some basic ideas for me start. Thank you so much in advance.

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• Can I find the session ID for a user logged on to another machine?

  - by Dan

  I want to open an application on another computer on the same network via the command line. The scenario here is that the user is in a room surrounded by about 20 computers and wants to be able to launch the same app on every computer without walking from screen to screen opening it up on each individual machine. I've discovered that I can get the basic functionality for this using PsExec as follows: psexec \\[computer] -u [username] -p [password] -d -i [SessionID] [program] For computer, username, password, and program, I'm good. Does anyone know of a way I can figure out which SessionID is assigned to a particular user logged on to a particular machine on the network? Alternately, is there a better way to go about what I'm trying to accomplish?

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• Problem running application on windows server 2008 instance using amazon ec2 service and WAMP

  - by Siddharth

  I have a basic (small type) windows server 2008 instance running on amazon ec2. I've installed WAMP server on to it, and have also loaded my application. I did this using Remote desktop Connection from my windows machine. I'm able to run my application locally on the instance, however when I try to access it using the public DNS given to it by amazon, from my browser, I'm unable to do so. My instance has a security group that is configured to allow HTTP, HTTPS, RDP, SSH and SMTP requests on different ports. In fact I have the exact same security group as the one used in this blog, http://howto.opml.org/dave/ec2/ I did almost everything same as the blog, except for using a different Amazon Machine Image. This is my first time using amazon ec2, and i can't figure out what I'm doing wrong here

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• Postfix - exclude messages with specific header values from relayhost?

  - by Kyle MacFarlane

  Starting with the following basic configuration to relay all messages in Postfix to PostMarkApp.com: #start postmarkapps settings smtp_sasl_auth_enable = yes smtp_sasl_password_maps = static:secret:secret (where "secret is your API key") smtp_sasl_security_options = noanonymous relayhost = [smtp.postmarkapp.com]:25 #end postmarkapp settings The problem with this is if for example something starts spitting our error messages they will all go through PostMark and cost money. One way to bypass relayhost is to setup sender_dependent_relayhost_maps and have certain addresses map back to yourdomain.com. But this doesn't work in web apps where all messages are sent by the same user but with varying From headers. So how can I achieve the same effect as sender_dependent_relayhost_maps but looking at the From or Subject headers instead of merely the user?

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• Getting rid of GNU Emacs's menu bar in terminal windows

  - by Ernest A

  How to get rid of Emacs's menu bar in terminal windows? The standard answer is to put (when (not (display-graphic-p)) (menu-bar-mode -1)) in init.el. However, this solution is not good, because all it does is remove the menu bar after the fact. You can still see it for a split second. It's very annoying. Looking at the source code in startup.el I don't see an obvious solution to this problem. I think the only way is to use before-init-hook. Maybe this could do the trick? (add-hook 'before-init-hook (lambda () (setq emacs-basic-display t))) But this hook is run before init.el and other init files are evaluated, so how is one supposed to use it?

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• puppet agent doesn't retrieve files from master

  - by nicmon

  I have a very basic question regarding to Puppet 3.0.1 configuration. I setup a puppet master server (CentOS) with 2 agents (CentOS and Windows 7), all 3 can ping and access each other. There is no error at all. I have copied a file under /etc/puppet/files/test2.txt my site.pp (/etc/puppet/manifests) contains these lines: node default { include test file { "/tmp/testmaster.txt": owner => root, group => root, mode => 644, source => "puppet:///files/test2.txt" } } but there will no file be created on agent servers under /tmp/ once I run "puppet agent --test" here is the output: [root@agent1 ~]# puppet agent --test Info: Retrieving plugin Info: Caching catalog for agent1.mydomain.com Info: Applying configuration version '1354267916' Finished catalog run in 0.02 seconds "puppet apply /etc/puppet/manifests/site.pp" creates the testmaster.txt under /tmp/ on master.

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• Best practice for ONLY allowing MySQL access to a server?

  - by Calvin Froedge

  Here's the use case: I have a SaaS system that was built (dev environment) on a single box. I've moved everything to a cloud environment running Ubuntu 10.10. One server runs the application, the other runs the database. The basic idea is that the server that runs the database should only be accessible by the application and the administrator's machine, who both have correct RSA keys. My question: Would it be better practice to use a firewall to block access to ALL ports except MySQL, or skip firewall / iptables and just disable all other services / ports completely? Furthermore, should I run MySQL on a non-standard port? This database will hold quite sensitive information and I want to make sure I'm doing everything possible to properly safeguard it. Thanks in advance. I've been reading here for a while but this is the first question that I've asked. I'll try to answer some as well = )

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• How to recursively move all files (including hidden) in a subfolder into a parent folder in *nix?

  - by deadprogrammer

  This is a bit of an embarrassing question, but I have to admit that this late in my career I still have questions about the mv command. I frequently have this problem: I need to move all files recursively up one level. Let's say I have folder foo, and a folder bar inside it. Bar has a mess of files and folders, including dot files and folders. How do I move everything in bar to the foo level? If foo is empty, I simply move bar one level above, delete foo and rename bar into foo. Part of the problem is that I can't figure out what mv's wildcard for "everything including dots" is. A part of this question is this - is there an in-depth discussion of the wildcards that cp and mv commands use somewhere (googling this only brings very basic tutorials).

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• Reverse Engineer Formula

  - by aaronls

  Are there any free programs or web services for reverse engineering a formula given a set of inputs and outputs? Consider if had 3 columns of data. The first two numbers are inputs, and the last one is an output: 3,4,7 1,4,5 4,2,6 The outputs could be produced with simply a+b, but there could be many formulas that would give the same result of course. I am talking about data without any error or deviation, and I think the formula would only need basic operations(divide, multiply, add, sutbract) and possibly use one of floor/ceiling/round.

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• windows hosted networok on windows 8

  - by tanmaysingh

  my sister is using Acer laptop, that has an intel WLAN card and supports windows hosted network(checked in command prompt).Am using the basic way using netsh wlan command also, then am using netsh start wlan command.The hosted network gets created and it could b seen in "Network and Sharing Center" as the . I also went to Device manager, selected WLan card, made sure"allow this device to wake computer from sleep" is selected. Now I went to the newly created , clicked properties, and under sharing enabled allow this to be shared(but I am not able to select The name of the wifi my sis wants to share (in this case her college wifi name, LEts say QP4,Ethernet and Local Area connection are the only two option that are coming). Also the SSID name is not being shown in her mobile nor when I click the tower icon at the tray area,Any suggestions on what might be going wrong?She is using windows 8. Should I look for updated drivers? Her laptop is only 6 months old, i don't think the drivers are outdated. Any advice shall be appreciated.

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• Stuck GhostScript processes, how to debug?

  - by Jonathan

  Having a problem with Ghostscript processes that don't end. This does not happen often, probably once every 3 weeks we see this issue with 1-3 processes. Running CentOS 6.4 on a VPS from Rackspace. We use PrinceXML to generate PDFs which uses GhostScript to handle fonts. Here's an image of top: http://i.stack.imgur.com/J9D7D.jpg As you can see those two processes are using a lot of resources, I haven't killed them yet in hopes someone can help me diagnose. I'm a developer not a server admin so I have a basic knowledge of *nix but no clue on how to fix this. Installed strace and ran it on each process with the following command: strace -p 20619 -s 80 -o gs.txt Left it for 5m, gs.txt is empty? Thanks in advance!

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• powershell Read-host does not stop for input

  - by llirik42

  I thought this would be fairly basic, but i'm stuck. I have 3 lines of powershell script in which I want to collect a mailbox name from user input, then create names based on that mailbox name. (later the script proceeds to create the groups in AD, etc) my problem is that when I run all 3 of these lines by pasting them into powershell window, I don't get a change to enter the response to read-host. Instead the script just scrolls through to the next line and uses it as the response for the Read-Host here's the powershell: $name = read-host "enter group name" $groupfull = ($name+'.Full'a) $groupsendas = ($name+'.SendAs') Here's the output: PS C:\Users\kg> $name = read-host "enter group name" enter group name: $groupfull = ($name+'.Full') PS C:\Users\kg> $groupsendas = ($name+'.SendAs') PS C:\Users\kg> Thanks in advance

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• REMOTE_USER through Apache reverse proxy

  - by Laurent

  I have an Apache webserver with mod_proxy enabled and a Virtualhost, proxy.domain.com. This proxy is configured to prompt the user for credentials with AuthType Basic. Then, the content of web.domain.com is available through the proxy with ProxyPass and ProxyReverse. However, the REMOTE_USER variable is empty. I read different things to achieve this with mod_rewrite and mod_headers but all my tries have failed. Does anybody has been luckier than me? Thanks.

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• emacs not load (.emacs) configuration file

  - by ant2009

  I am using emacs on ubuntu 9.04. I have my emacs configuration file in ~/.emacs.d directory. My emacs file is called .emacs I have some basic configuration. However, everytime I start emacs it never loads my configuration and I have to keep doing it manually using i.e. M-X Transient-mark-mode My emacs file is listed below: ;; Emac customization file path (add-to-list 'load-path "~/emacs.d") ;; Use font lock mode (global-font-lock-mode t) ;; Highlight cursor line (global-hl-line-mode t) ;; Highlight selected region (transient-mark-mode t) I want to add to this configuration instead of manually added entries. Many thanks for any advice,

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• Create intentional border with xrandr

  - by benizi

  Is there a way to tell xrandr "this space intentionally left blank"? I have a laptop that drives its internal display at 1920x1080, but the external monitor I'm using, due to its different aspect ratio, doesn't have that mode. It runs at 1920x1200. So, the basic setup: xrandr \ --output LVDS-1 --mode 1920x1080 \ --output DP-1 --mode 1920x1200 --same-as LVDS-1 [not to scale:] +-----------------------------------+ ¦ ¦ ¦ ¦ (laptop) ¦ (external) ¦ ¦ (LVDS-1) ¦ (DP-1) ¦ ¦ ¦ ¦ ¦ ¦ ¦ +-----------------¦ ¦ (blank...) ¦ ¦ +-----------------+ How can I specify that the 1920x120-sized region below LVDS-1 should be displayed as a black bar that can't be accessed by mouse on DP-1? I tried just coping with --panning 1920x1200+0+0/1920x1080+0+0/0/0/0/120, but I found the screen movement to be very annoying. Update: I found a workaround. (Update 2: changed it to an answer, per suggestion -- workaround doesn't answer the underlying question of leaving space blank.)

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• Windows 8.1 & manual removal of "Sentinel Runtime Drivers"

  - by uos??

  I'm trying to install Windows 8.1 (basic upgrade from Windows 8). It is complaining of Sentinel Runtime Drivers incompatibility. I've looked for it in my Programs & Features list, but it's not there by that name nor SafeNet (as related by google search) nor do I see any obvious candidates for it having been bundled with another listed application. I tried the "Sentinel Runtime Driver Cleanup" program from the SafeNet website. It ran but was ineffective, even after a reboot. Do you recognize this "Sentinel Runtime Drivers"? I ran MalwareBytes too, just in case, but it found nothing.

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• How to configure what certificates can be issued using Web Enrollment in Windows Server 2008 R2 Enterprise?

  - by antik

  I have a CA installed on of my Windows Servers in a small farm of systems. I've installed the Certification Authority Web Enrollment and Certificate Enrollment Web Service roles on the CA. I want to issue a Computer certificate to a computer not jointed to my domain. The user attempting web enrollment has domain credentials. The user was able to navigate to https://myServerHostname/certsrv and request a User certificate successfully. However, the user needs a Computer cert as well. From the certsrv site, the user tried the following: Advanced Certificate Request Create and Submit a Request to this CA However, the Computer certificate template is not available under the Certificate Template heading. He is only seeing "User" and "Basic EFS". How do I configure the CA to allow him to request a Computer cert for his system?

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• Setting up Mac VPN on simple network with separate IPs

  - by Dave

  Hi there, We have a pretty simple network configuration. A typical ASDL line with two extra IP addresses. We have a basic home network router Dlink DIR-655. We have two Mac OS X Snow Leopard Servers that we want to setup VPN on. The problem is that we can't change the ports which VPN works under ie. we can only setup port forwarding for UDP 500,1701,4500 to a single server. I'm wondering how we can cost effectively re-work our network so that we can take advantage of the separate IP addresses and have both VPNs working with the same router. Is that possible with our current hardware setup or do we need something more powerful? We're also toying with Mobile Access and wondering if that might be easier to setup. Expert help is greatly appreciated.

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• How a router decides destination of packet?

  - by user58859

  I have basic networking question. Scenario : Two pc's are communicating on a wan. Both the pc's ate behind routers or modems. My question : Both the pc's have public IP of each other. That public IP is most of the time is either of the router or of the modem. There can be more then one pc's behind those routers and modems. Then how the pc's are communicating. I can understand the packets can reach upto those routers or modems. But what after that. In the packet , destination IP is public IP. Then how the router or modem decides where to send the packet? Can anybody explain me this please. Thanks in advance.

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