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• Custom prompt doesn't work on Mac Terminal

  - by mareks

  I like to use a custom prompt (current path in blue) on my unix machine: export PS1='\[\e[0;34m\]\w \$\[\e[m\] ' But when I try to use it on Mac's terminal it doesn't work: it fails to detect the end of the prompt and overwrites the prompt when I type commands. This also happens when I'm inputting a long command where it wraps over the same line instead of starting a new line. I don't understand why this is the case since I use bash on both machines. Any suggestions on how to remedy this?

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• Mirroring of Apps across servers

  - by user1038814

  We wish to host multiple apps across multiple servers. What we are looking for (ideally) is an existing solution which will work. For example, normally to do it we'd follow a route (for failover) like: App is installed on one server along with mysql database App is also installed on a second server. Rsync is used to mirror the files over to the second server and ensure consistency MySQL is installed with a Master-Slave setup. We use a service such as DNS Made Easy which has a DNS failover. If one server goes down it automatically routes traffic to the backup server We have done the above a few times and generally its fine. The issue I have here is that the above is for one app. What I would like to look at is how we can manage for multiple apps and if there is a layer (such as VMWare) that has complete mirroring built in at the OS level? For example how do web hosts currently do it when they ensure that more than one machine is running a bunch of hosted websites. If you were running hosting and you had 200 clients on a server you would want the same clients across 2 or more servers and want everything mirrored. Any advice would be much appreciated.

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• Why Windows Media Center (Vista 32-bit) unable to record TV Series?

  - by Alex R

  I can record individual shows just fine, but trying to setup the recording of a Series throws an error (something like, "unable to schedule, try restarting Media Center", pops up in the bottom right of the screen). Trying to access the "Other Showings" menu causes Media Center to crash ("check for a solution online" dialog comes up). The machine is a fresh reinstall of 32-bit Windows Vista from the HP recovery CDs, plus all Microsoft updates and service packs. Hardware: HP s3220n, AMD X2 5000+, 2GB RAM, 300GB free space on disk. Media Center came bundled. The "Media Center update for Vista" failed to install (it says, not appropriate for my computer). Any ideas? Thanks

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• Stopping/Starting windows services

  - by Geek

  I have four windows services which start up automatically when the machine starts. There after, I want to restart those services every 8 hours in a particular order. For eg. Stop s1,s2,s3,s4 and than restart them in some other order like s4,s3,s2,s1. The condition is that I should wait for each service to stop completely before I stop another one. I would want to write a .BAT or some script. Is it possible to define a CRON for 8 hours, this is not there in Advanced tasks ? Can I do it using windows scheduler ? Please suggest. thanks in advance.

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• TFS 2010 Check-in Policies

  - by Liam

  Currently we have check-in policies that are implemented by installing the TFS 2010 Power Tools on each developer machine. I was wondering if there was a way we could store those policies centrally within the TFS Server itself and push them out to the Developer machines in a group policy fashion without having to install anything additional on the Developer machines as realistically we only want the Power Tools on a couple of people's machines. I can't seem to find any documentation on how to do this or if it's possible so if someone could point me in the right direction I'd be very grateful.

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• How to better explain complex software process in software specs?

  - by Lostsoul

  I'm really struggling with my software specs. I am not a professional programmer but enjoy doing it for fun and made some software that I want to sell later but I'm not happy with the code quality. So I wanted to hire a real developer to rewrite my software in a more professional way so it will be maintainable by other developers in the future. I read and found some sample specs and made my own by applying their structure to my document and wanted to get my developer friend to read it and give me advice. After an hour and a half he understood exactly what I was trying to do and how I did it(my algorithms,stack,etc.). How can I get better at explaining things to developers? I add many details and explanations for everything(including working code) but I'm unsure the best way I can learn to pass detailed domain knowledge(my software applies big data, machine learning, graph theory to finance). My end goal is to get them to understand as much as possible from the document and then ask anything they do not understand, but right now it seems they need to extract alot of information from me. How can I get better at communicating domain knowledge to developers?

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• Grepping through the results of apachectl -S

  - by CamelBlues

  I have a server with about 300 virtual hosts. When I want to make sure a specific httpd.conf file is loaded into the Virual Host config and the syntax is correct, I run apachectl -S. The problem is, though, I get a ton of output. I've tried apacectl -S | grep 'foo' and apachectl -S > foo.txt to try and make this data a little bit more manageable, but the output of the command is not conducive to grepping or shoving into a text file. When I try apachectl -S | grep 'foo', it simply returns the entire output of apachectl -S. When I try apachectl -S > foo.txt, foo.txt is an empty file. This may have something to do with how the server is configured, because I am able to successfully grep on my local machine. Any suggestions?

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• Firefox 11.0 Right-Click Dropdown Menu (and Menu Options at Window Top) Flickering - Potential Bug?

  - by nicorellius

  About a week ago my Windows 7 machine starting exhibiting odd Firefox behavior. When I right click on something the drop-down menu flickers and when the mouse is hovering over a field, I can't really see it. This same behavior happens in other ways too, like in the top File, Edit , View, etc menus. I click them and they flicker, when I hover over them, and then they get obscured when I hover over the one I want. I did some research and didn't really find anything. Some people found similar behavior in applications THEY were building. But mine is a global problem. Happens on all sites, as far as I can tell. This is why I suspect it's my Firefox installation. I thought about reinstalling, but if there was another option, I'd like to explore that too. The behavior is not really capture-able, so I don't have anything except words to describe it. Sorry ;-( Thanks.

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• XPS M1730 Freezing & Crashing unexpectedly

  - by evesirim

  I have a Dell XPS M1730, freshly installed with Windows 7 Professional 32-bit that every so often crashes completely unexpectedly. It need not be running any applications at all for this to happen, never mind anything particularly intensive. It also clearly is not a BSoD issue as no Minidump files are being created in the process. All drivers are up to date and have been both rolled back and then updated and the Device Manager reports no issues. There are very few applications installed on the machine and it has only been online once. It runs a minimal boot of Win7 and yet still after all of this something is making it crash. All of this suggests to me it may be more like a hardware problem but to be honest I really have no idea - so I thought I'd try here. Any thoughts...? Many thanks in advance

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• Do there exist programming languages where a variable can truly know its own name?

  - by Job

  In PHP and Python one can iterate over the local variables and, if there is only once choice where the value matches, you could say that you know what the variable's name is, but this does not always work. Machine code does not have variable names. C compiles to assembly and does not have any native reflection capabilities, so it would not know it's name. (Edit: per Anton's answer the pre-processor can know the variable's name). Do there exist programming languages where a variable would know it's name? It gets tricky if you do something like b = a and b does not become a copy of a but a reference to the same place. EDIT: Why in the world would you want this? I can think of one example: error checking that can survive automatic refactoring. Consider this C# snippet: private void CheckEnumStr(string paramName, string paramValue) { if (paramName != "pony" && paramName != "horse") { string exceptionMessage = String.Format( "Unexpected value '{0}' of the parameter named '{1}'.", paramValue, paramName); throw new ArgumentException(exceptionMessage); } } ... CheckEnumStr("a", a); // Var 'a' does not know its name - this will not survive naive auto-refactoring There are other libraries provided by Microsoft and others that allow to check for errors (sorry the names have escaped me). I have seen one library which with the help of closures/lambdas can accomplish error checking that can survive refactoring, but it does not feel idiomatic. This would be one reason why I might want a language where a variable knows its name.

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• Best practice- handling images on website

  - by Steve

  I am porting an old eCommerce site to MVC 3 and would like to take advantage of design improvements. The site currently has product images stored in 3 sizes: thumbnail, medium (for display in a list) and expanded for a zoomed look. Right now we are having to upload 3 separate images that are sized exactly right, provide 3 different names that match what the site expects, etc., it is a pain. I'd like to upload just 1 file, the large one, then let the site reduce it to needed sizes, and I'd like the flexibility to change the thumbnail and list sizes depending on user preferences, form factor (e.g. mobile, iPad, desktop), etc. so might need many copies of the same image. My question is should the image be reduced then saved several times upon upload and if so what is a good storage/naming convention? The other idea is to store just the single image but resize it programmatically before serving it to the client. Has anybody done this and what are the tradeoffs besides a few more machine cycles? How do you pass a temporary image in memory to the client (there is no URL)?

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• nslookup returning different results

  - by Sterno

  I'm having a problem with my machine. A site that I used to be able to access is no longer being found. After running nslookup, I notice that about 9 times out of 10 it returns a specific IP which times out if I ping it, but about 1 in 10 times it returns a different IP which works when I ping it. I've even tried adding an option parameter into nslookup to hit different DNS servers (such as Google's public DNS) and am getting the same result. Any idea what would cause the IP returned by DNS lookup to change back and forth like that?

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• DNS for route between WAN & LAN

  - by David Maitland

  I have a few machines set up on my internal 192.168.1.* network and i have one public ip, my router is links all ports to on internal linux machine on my network 192.168.1.3. I want to know how to configure the DNS server on my linux box to forward to internal LAN ip's depending on the host name. EG. computer4.83.22.56.12 would find my box then forward to 192.168.1.4 on the local network. This is so i can run multiple web server under one ip. btw, i use Ubuntu. Thanks Dave

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• RAID 5 heavy IO hard freezes Ubuntu: Why?

  - by Luke has no name

  I have a software RAID 5 partition on LVM in Ubuntu (desktop, actually, but I'm using it as a server). I have been rsyncing a ton of data to it, and the computer was hard freezing, as in I needed to press "Reset". So I thought it was rsync. But I decided I'd try a dd if=/dev/zero of=/path/to/raid5 and sure enough, the computer locked up. Did an identical dd to a JBOD partition on the same machine, and it didn't crash. Assuming a clean RAID5 partition, tri-core processor 2GB of ram, 6GB swap, what could be causing this?

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• How do I restore a Windows 8 iso image to a USB disk in OS X?

  - by duci9y

  I am on OS X and have a Windows 8 Consumer Preview x64 image. My computer doesn’t have a CD drive (MacBook Air). I have a 4 GB USB drive. I want to restore that image to the USB drive. There are many tools to do that on Windows, but I can’t finger out how to do it in OS X. Please note that I can’t run a VM, as my Air is a limited use machine. What I’ve tried: Simply restore to USB. Convert the image to img and use dd. These don’t work. How do I go about doing this?

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• How does hadoop decide what its nodes hostnames are?

  - by Dan R

  Currently the urls generated by the jobtracker & namenode return either hostnames like bubbles.local or just bubbles. These end up not resolving unless the client machine has specified these in their /etc/hosts file. When I run the hostname command on these machines it returns a hostname complete with the domain (E.G bubbles.example.com) Running a small java test on these machines InetAddress addr = InetAddress.getLocalHost(); byte[] ipAddr = addr.getAddress(); String hostname = addr.getHostName(); System.out.println(hostname); Produces output just like the hostname command. Where else could hadoop be grabbing a hostname to use in its jobtracker / namenode UI? This is occurring in clusters with Hadoop 1.0.3 and 1.0.4-SNAPSHOT from early august. The machines are running CentOS release 5.8 (Final). The generated URLs I'm referring to are like this http://example:50075/browseDirectory.jsp?namenodeInfoPort=50070&dir=/ or http://example.local:50075/browseDirectory.jsp?namenodeInfoPort=50070&dir=/

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• Windows Remote Desktop with multiple monitors

  - by BDW

  I'm looking for a remote desktop product that will allow me to switch on the fly between how many monitors the desktop is using. This would be going from one Windows 7 machine to another, one is running Ultimate, the other Enterprise. I know I can use Windows RDP with multi-monitor support, but it seems that only allows me to use ALL monitors, and if I switch to a windowed view, I get huge scrollbars because I'm going from 3 monitors to 1 window. What I'm looking for is something that will allow me to switch from 1, 2, or 3 monitor displays without restarting the RDP and would end up with a true 1/2/3 display - ie, if I go from 3 monitors to 1, or a window, I don't get scrollbars. Is there any such product?

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• Change Apache DocumentDirectory path in trueCrypt partition

  - by Alan C

  Hello, I'm recently moving from windows to linux, so I've setup my machine to dual boot Windows7 and Ubuntu 10.04. I was able to successfully setup Apache on the Ubuntu partition, but I need to move the DocumentRoot since my websites are on a TrueCrypt partition that is in another hard drive so I can have them accessible in both OS. I followed some guides on how to change the path for the DocumentRoot so I end up modifiying the default file at /etc/apache2/sites-available DocumentRoot /media/truecrypt1/www <Directory /> Options FollowSymLinks AllowOverride None </Directory> <Directory /media/truecrypt1/www/> Options Indexes FollowSymLinks MultiViews AllowOverride None Order allow,deny allow from all </Directory> Those are the lines that I've changed, but now when I go to localhost I always get the Forbidden You don't have permission to access / on this server. Apache/2.2.14 (Ubuntu) Server at localhost Port 80

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• Is there a way to schedule an automatic WinClone run on my Bootcamp partition?

  - by user17873

  Hi, I've currently got time machine setup to back up my entire OS X installation. I also have a backup tool within my Bootcamp Windows 7 installation which automatically backs up my windows profile data to an external drive partition. Finally, I'm also backing up my Bootcamp partition weekly and storing on an external drive using WinClone. The final piece I need to complete my external backup process is to have the WinClone application backup my Bootcamp partition automatically once a week rather than having to call it manually and remember. Is this possible?

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• How to get the Host value inside ~/.ssh/config

  - by iconoclast

  Within a ~/.ssh/config or ssh_config file, %h will give you the HostName value, but how do you get the Host ("alias") value? Why would I want to do that? Well, here's an example Host some_host_alias HostName 1.2.3.4 User my_user_name PasswordAuthentication no IdentityFile ~/.ssh/some_host_alias.rsa.id LocalCommand some_script.sh %h # <---- this is the critical line If I pass %h to the script, then it uses 1.2.3.4, which fails to give it all the options it needs to connect to that machine. I need to pass some_host_alias, but I can't find the % variable for that. (And: yes! I'm aware of the risk of recursion. That's solved inside the script.) UPDATE: Kenster pointed out that I could just hard-code the Host value as an argument to the script. Of course this will work in the example I gave, but it won't work if I'm using pattern matching for the Host.

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• Random TCP Resets

  - by allenwei

  We got randomly TCP "reset" error when we send request to remote server. Log from remote server Cisco TCP Connection Terminated,Nov 05 14:43:39 EST: %ASA-session-6-302014: Teardown TCP connection 640068283 for Outside:xxxx to xxxx duration 0:00:00 bytes 4160 TCP Reset-O One my local machine I saw when I use netstat 100703 connections reset due to unexpected data 324186 connections reset due to early user close I also use tcpdump to see what's wrong with it, I saw xxxx.https: Flags [R.], seq 290, ack 1369, win 136, options [nop,nop,TS val 2871790533 ecr 1897173283], length 0 The problem just happened today, we didn't change anything on our server. Anyone know what's wrong with it? Is it related to code we wrote send out request or related to linux configuration?

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• Why does compiz window decorator crashes unity

  - by user32509

  I used to run Unity 2D on my work machine. Now I am trying to use Unity. Everthing looks fine except for the missing window decoration. I have installed the compiz manager. Every time I activate the plugin "window decoration" Unity "crashes" the Unity bar along with the top panel . unity --reset oder replace does nothing. The command for the window manager is /usr/bin/compiz-decorator Maybe I need to specify another window decorator?

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• VirtualBox VRDP server doesn't start on Windows

  - by quanticle

  I've installed VirtualBox 4.1.8 on a Windows 7 Ultimate host system. I've set up an Arch Linux VM that starts just fine from the VirtualBox GUI. However, when I try to start it with VBoxHeadless --startvm <vm_name> it prints the following Oracle VM VirtualBox Headless Interface 4.1.6 (C) 2008-2011 Oracle Corporation All rights reserved. and then it just sits there. I never get the VRDE server is listening on port 3389 message like when I start a headless VM on a Linux machine. Do I have to configure anything else in order to get the VRDE server to run?

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• Shutdown button doesn't work in Windows 8

  - by Yob

  Some time ago I installed Windows 8 64bit ready-to-market version (as a student I had access to it before premiere). What I discovered is that the "shutdown" button doesn't work. When I want to shutdown the computer it simply logs me out. In order to turn off my machine I have to click "restart" and then simply press the poweroff button. I installed some updates but this issue is still not resolved. Is there any way to shutdown the computer in a normal way?

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• "bin/sh: can't access tty; job control turned off” error when running shellcode"

  - by Nosrettap

  I'm writing shellcode to exploit a buffer overflow vulnerability on a server. To do so I have port binding shellcode that I send to the server and then I run (from a linux terminal) the command telnet serverAdress 4444 where 4444 is the port which I have opened up. The hope is that I will receive a shell back that I can use to execute commands. However, I always end up with the command bin/sh: can't access tty; job control turned off I can't change any of the server code, and I believe the shellcode is correct because I got it from this website (http://www.tsirogiannis.com/exploits-vulnerabilities-videos-papers-shellcode/linuxx86-port-binding-shellcode-xor-encoded-152-bytes/). From my research, it appears that this may have to do with the mode that my terminal is running in (something called interactive mode...or something like that). All computers involved are linux machines and the machine that I am on is running the latest version of Ubuntu. Any ideas what this job control error means and how I can fix it?

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