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  • Implication of variable context switching time

    - by Rob
    Hi, I know that constant switching time of the Linux scheduler was a big achievement. I was just asking myself the question what would be the implication of a non-constant switching time. The only obvious reason I can think of is real-time systems where we have to meet deadlines. There it is obviously no ideal if the switching time is "random". Are there any other good reasons that favour constant switching times? Many thanks, Rob

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  • ash scripting: space-containing variable refuses to be grepped

    - by Luci Sandor
    I am trying to run the script listed at http://talk.maemo.org/showthread.php?t=70866&page=2 on its intended hardware, a Nokia Linux phone running BusyBox ash. The script receives the name of WiFi network as a parameter, and tries to connect the phone to it. I suspect the script works, but my SSID, BU (802.1x), has space and parentheses in it. So when I type at the command prompt autoconnect.sh BU\ \(802.1x\) I get various errors. First, LIST=`iwconfig wlan0 | awk -F":" '/ESSID/{print $2}'` if [ $LIST = "\"$1\"" ]; then ...fails, even I am connected to the network. The error is not avoided by using single or double quotes instead of escaping characters at the command prompt. Second, if [ -z `iwlist wlan0 scan | grep -m 1 -o \"$1\"` ]; then echo SSID \"$1\" not found; shows that grep does not find the string, although the same grep, typed directly into the command prompt, does find 'BU (802.1x)'. How do I quote $1 in the two circumstances above so that it will work with my network SSID, containing spaces and parentheses? Thank you.

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  • emacs error: "Symbol's value as variable is void: hostname"

    - by Florian Pilz
    After I installed emacs this error occurs every time on startup. It prevents me from installing plugins, e.g. auctex via aptitude. I already tried to install a plugin by hand (rails for ruby), but doesn't work. The error doesn't contain the message "hostname", but the hostname of my PC is displayed ("bloodredangel-ubuntu"). I changed my hostname to "bloodredangel", but the error message stays the same. While I changed my hostname I saw that in /etc/hostname were two entries: 127.0.0.1 bloodredangel-ubuntu I already asked this question in an ubuntu forum but they couldn't help. They recognised an misconfigured /etc/hosts file, which I corrected, but from time to time these incorrect configurations get attached by something. I didn't add them by hand, maybe it has something to do with the issue. The misconfigurations looked like this: 127.0.0.1 127.0.0.1 bloodredangel-ubuntu localhost.localdomain localhost 127.0.0.1 127.0.0.1:8080 bloodredangel-ubuntu localhost.localdomain localhost I didn't found a solution on the internet, so I hope I will find help here finally.

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  • pam_exec.so PAM module does not export variable PAM_USER as stated in the documentation

    - by davidparks21
    I'm trying to use the pam_exec.so PAM module to execute a script which needs to know the username/password coming from the application (OpenVPN in this case). I have a script that executes printenv >>afile, but I don't see all the environment variables that the man pages states that pam_exec.so exports (namely PAM_USER I think), I only see the following: PAM_SERVICE=openvpn PAM_TYPE=auth PWD=/usr/local/openvpn/bin SHLVL=1 A__z="*SHLVL I do successfully pick up the password off of STDIN and output it with this same script. But for the life of me I can't get the username. Any thoughts on what I should try next?

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  • Puppet&Hiera: $variable is not an hash or array when accessing it

    - by txworking
    I wrote a puppet module and the content of init.pp was: class install( $common_instanceconfig = hiera_hash('common_instanceconfig'), $common_instances = hiera('common_instances') ) { define instances { common { $title: name => $title, path => $common_instanceconfig[$title]['path'], version => $common_instanceconfig[$title]['version'], files => $common_instanceconfig[$title]['files'], pre => $common_instanceconfig[$title]['pre'], after => $common_instanceconfig[$title]['after'], properties => $common_instanceconfig[$title]['properties'], require => $common_instanceconfig[$title]['require'] , } } instances {$common_instances:} } And the hieradata file was: classes: - install common_instances: - common_instance_1 - common_instance_2 common_instanceconfig: common_instance_1 path : '/opt/common_instance_1' version : 1.0 files : software-1.bin pre : pre_install.sh after : after_install.sh properties: "properties" common_instance_2: path : '/opt/common_instance_2' version : 2.0 files : software-2.bin pre : pre_install.sh after : after_install.sh properties: "properties" I always got a error message When puppet agent run Error: common_instanceconfig String is not an hash or array when accessing it with common_instance_1 at /etc/puppet/modules/install/manifests/init.pp:16 on node puppet.agent1.tmp It seems $common_instances can be got correctly, but $commono_instanceconfig always be treated as a string. I used YAML.load_file to load the hieradata file, and got a correct hash object. Can anybody help?

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  • How to add a variable into a grep command

    - by twigg
    I'm running the following grep command var=`grep -n "keyword" /var/www/test/testfile.txt` This work just as expected but I need to insert the file name dynamically from a loop like so: var=`grep -n "keyword" /var/www/test/`basename ${hd[$i]}`.txt` But obviously the use of ` brakes this with a unexpected EOF while looking for matching ``' and unexpected end of file Any ideas of away around this?

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  • Initiate a PHP class where class name is a variable

    - by ed209
    I need some help with an error I have not encountered before and can't seem to find anywhere. In a PHP mvc framework (just from a tutorial) I have the following: // Initiate the class $className = 'Controller_' . ucfirst($controller); if (class_exists($className)) { $controller = new $className($this->registry); } $className is showing the correct class name (case is also correct). But when I run it I get this in the apache error log (no php error) [Wed Mar 31 10:34:12 2010] [notice] child pid 987 exit signal Segmentation fault (11) Process id is different on every call. I am running PHP 5.3.0 on os x 10.6. This site seems to work on 5.2.11 on another Mac. Not really sure where to go next to debug it. I guess it could be an apache setting as much as a php bug or a problem with the code... any suggestions on where to look next?

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  • variable bitrate streaming under linux

    - by ufk
    Hi. i know that in Linux i can stream using vlc and ffmpeg. i was able to successfully stream using vlc but only in static bitrates. i must set 400k/s or 800k/s. i want it to use as much upload bandwidth as it can consume. so if my internet line is not busy and i'm not downloading anything the quality will be better. is it possible to do such a thing?

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  • How to get LAN ip to a variable in a Windows batch file

    - by Ville Koskinen
    I'm streaming audio from my Windows 7 laptop to a sound card attached to a router. I have a little batch script to start streaming. REM Kill any instances of vlc taskkill /im vlc.exe "c:\Program Files\VideoLAN\VLC\vlc.exe" <parameters to start http streaming> REM Wait for vlc TIMEOUT /T 10 REM start playback on router plink -ssh [email protected] -pw password killall -9 madplay plink -ssh [email protected] -pw password wget -q -O - http://192.1.159:8080/audio | madplay -Q --no-tty-control - & As you see the http stream is hard coded. It would be nice to get the address dynamically to reuse the script on other machines. Any ideas?

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  • Changing PATH Environment Variable for all Users. (Ubuntu)

    - by Wally Glutton
    I recently compiled Ruby Enterprise Edition (REE) on an Ubuntu 8.04 server. I would like to update my PATH to ensure this new version of Ruby (found in /opt/ruby_ee/bin) supersedes the older version in /usr/local/bin. (I still want the old version around, though.) I would like these PATH changes to affect all users and crontabs. Attempted Solution #1: The REE documentation recommends placing the REE bin folder at the beginning of the global PATH in /etc/environment. I altered the PATH in this file to read: PATH="/opt/ruby_ee/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" This did not affect my PATH at all. Attempted Solution #2: Next I followed these instructions and updated the PATH setting in /etc/login.defs and /etc/crontab. (I did not change /etc/sudoers.) This didn't affect my PATH either, even after logging out and rebooting the server. Other information: I seem to be having the same problem described here. I'm testing using the commands "echo $PATH" and "ruby -v". My shell is bash. My .bashrc doesn't override my PATH. Yes, I have heard of the Ruby Version Manager project. ;)

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  • Question about RewriteRule and HTTP_HOST server variable

    - by SeancoJr
    In evaluating a rewrite rule that redirects to a specific URL and say the rewrite condition is met, would it be possible to use HTTP_HOST as part of the URL to be redirected to? Example in question: RewriteRule .*\.(jpg|jpe?g|gif|png|bmp)$ http://%{HTTP_HOST}/no-leech.jpg [R,NC] The motive behind this question is a desire to create a single htaccess file that would match against an addon domain (on a shared hosting account) and an infinite amount of subdomains below it to prevent hotlinking of images.

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  • Variable TTL inside a LAN

    - by user140783
    I recently discovered that ping my local router, returns different TTL values??. The ping 3 switch must pass through before reaching the router, there may be the problem? 192.168.1.99 is the IP of my router , a Cisco WRT120N Thank you! Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=190 Respuesta desde 192.168.1.99: bytes=32 tiempo=29ms TTL=3 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=117 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=131 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=66 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=66 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=66 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=111 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=240 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=66 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=66 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=66 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=51 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=190 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=66 Traceroute G:\Documents and Settings\Administrador>tracert 192.168.1.99 Traza a la dirección maxi2011 [192.168.1.99] sobre un máximo de 30 saltos: 1 <1 ms <1 ms <1 ms maxi2011 [192.168.1.99] Traza completa. G:\Documents and Settings\Administradorping 192.168.1.99 Haciendo ping a 192.168.1.99 con 32 bytes de datos: Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=190 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=190 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=117 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=117 Estadísticas de ping para 192.168.1.99: Paquetes: enviados = 4, recibidos = 4, perdidos = 0 (0% perdidos), Tiempos aproximados de ida y vuelta en milisegundos: Mínimo = 0ms, Máximo = 0ms, Media = 0ms G:\Documents and Settings\Administrador

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  • TEMP environment variable occasionally set incorrectly

    - by Roger Lipscombe
    Occasionally, I find my TEMP and TMP environment variables set to C:\Windows\TEMP. They should be set to %USERPROFILE%\AppData\Local\Temp, and are configured correctly in System Properties. This manifests itself as error messages like the following: ---> System.InvalidOperationException: Unable to generate a temporary class (result=1). error CS2001: Source file 'C:\Windows\TEMP\gb_pz65v.0.cs' could not be found error CS2008: No inputs specified ...which occurs in various .NET applications (in particular Visual Studio 2010 or SQL Server Management Studio). Alternatively, SQL Server Management Studio will report: Value cannot be null. Parameter name: viewInfo (Microsoft.SqlServer.Management.SqlStudio.Explorer) If I run PowerShell elevated, then $env:TEMP is set correctly. If I run PowerShell non-elevated, then it's not. I believe that it should be set correctly in both cases. If not, it's the wrong way round. The same is true for CMD.EXE. Rebooting fixes it, temporarily, until something breaks it again. Presumably something loaded into Explorer.exe is messing with its environment variables, but what? The values in the registry are correct, even while this is happening: HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment has TEMP = %SYSTEMROOT%\Temp HKCU\Environment has TEMP = %USERPROFILE%\AppData\Local\Temp By setting a breakpoint on shell32!RegenerateUserEnvironment, I'm able to trap it when it happens, but I still don't know why explorer.exe is reading the wrong environment variables. I can reproduce it consistently by broadcasting a WM_SETTINGCHANGE message (I wrote a one-line C++ program to do this). Watching the activity in Process Monitor shows that explorer.exe doesn't even look at HKCU\Environment. What is going on?

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  • dynamically allocating space for variable in ksh

    - by Govind Rajan
    I am new to ksh unix shell scripting.I need my ksh script to get inputs from the user. and the number of inputs is unkown. I need to get the inputs and process again further .The sample run could be : Enter the input values : Hello how are you Select two values from the above : how you Here the italized text are the inputs from the user.The inputs number given by the user is unknown .I down know how to handle the values given by user. Thanks in advance

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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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  • Powershell Registry value to be used as variable

    - by CWL
    I am looking on how to return one value from the registry. I only want the AGENTGUID value from this command. $reg=reg query "\\$computer\HKLM\SOFTWARE\Wow6432Node\Network Associates\ePolicy Orchestrator\Agent" /v Agentguid $reg will return this as one line. I only need {F789B761-81BE-4357-830B-368B5B3CF5E5} HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Network Associates\ePolicy Orchestrator\Agent Aentguid REG_SZ {F789B761-81BE-4357-830B-368B5B3CF5E5}

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  • Setting Environment Variable for nginx and Rails consumption

    - by kolrie
    Apache's module mod_env offers a handy way of setting environment variables in configuration files, like: <VirtualHost *:80> ServerName xyz.com DocumentRoot /var/www/rails_app/public PassengerAppRoot /var/www/rails_app SetEnv MY_VARIABLE contents </VirtualHost> http://httpd.apache.org/docs/2.0/mod/mod_env.html#setenv However, in nginx I couldn't find anything that serves the same purpose. What's the alternative here? I thought of setting environment variables in .profile files (I am using Ubuntu 10.04), but that wouldn't have the same "per vHost" isolation I have with Apache, right? What are the alternatives here?

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  • Puppet: variable overriding best practices

    - by rvs
    I'm wondering what are best practices for overriding variables in puppet. I'd like to have all my nodes (which located in different places, some of them are qa, some live) with same classes. Now I have something like this: class base_linux { <...> # something which requires $env and $relayhost variables } class linux_live { $relayhost="1.1.1.1" $env = "prod" include base_linux } class linux_qa { $relayhost="2.2.2.2" # override relayhost include base_linux } class linux_trunk { $env = "trunk" # override env inlude linux_qa } node "trunk01" { include linux_trunk include <something else> } node "trunk02" { $relayhost = "3.3.3.3" # override relayhost include linux_trunk include <something else> } node "prod01" { include linux_prod } So, I'd like to have some defaults in base_linux, which can be overrided by linux_qa/linux_live, which can be overrided in higher level classes and node definition. Of course, it does not work (and not expected to work). It does not work with class inheritance as well. Probably, I'll be able to archive using global scope variables, but it does not seems like a good idea to me. What is the best way to solve this problem?

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  • Nginx Redirect when URL includes variable p=1

    - by ChrisD
    Need to write a small nginx rewrite line(s) to alter/301 redirect some URLs within our existing website. for example: www.example.com.au/pageone.html?p=1 to www.example.com.au/pageone.html www.example.com.au/pagetwo.html?dir=asc&limit=200&order=price&p=1 to www.example.com.au/pagetwo.html?dir=asc&limit=200&order=price www.example.com.au/pagethree.html?dir=dsc&limit=100&order=price&p=1 to www.example.com.au/pagethree.html?dir=dsc&limit=100&order=price As you can see p=1 has been stripped from the URL's (as it is superfluous but has been live on the site and needs to be redirected now) - all http and https links. Basically if, and only if, p=1 is used anywhere within the URL then it should redirect to the same URL without the p=1. This should also let p=11, p=12 through as normal (and not redirect), as it is not specifically p=1. # # # # If that is not possible then, I'd like to know how to redirect this kind of URL as a standalone one off: www.example.com.au/pageone.html?p=1 to www.example.com.au/pageone.html I tried several redirects but they were all pointless and did not work, and was not able to get it working. To be honest I do not really know where to start with this - I am new to nginx.

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  • Set Permanent System variable through bat file

    - by shyameniw
    I want to change System variables in XP through running a bat file But when i run it i get the error Too many command-line parameters for the following code **set KEY="HKLM\SYSTEM\CurrentControlSet\Control\Sessions Manager\Environment" set PATHxx=%Path% reg add %KEY% /v Pathx /t REG_EXPAND_SZ 5 /d %PATHxx%** How can i fix this??

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  • How to make variable range of cells?

    - by Ertai
    In A column I have a set of numbers (over 1 000). I want to get average of ten of them (a1:a10) and wrtite into next column (B). Now I want to get next ten numbers and get average of them (a11:a20). And so on... How to get this if in C1 i would have number which is range (i.e 10 = a1:a10/a11:a20 ; i.e 25 a1:a25/a26:a50) of the cells? When I change C1 value I want to column B to update automaticaly? Is this possible?

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