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• App installed in ~/usr launches from terminal but not Applications menu (or why does setting ld_library_path in .profile not work as it should)

  - by levesque

  I have built and installed an application under a directory of my choosing, let's say under /home/jim/usr, so files have been put in three-four folders, all under this $HOME/usr folder (e.g., bin, include, lib, share, etc.). I can launch this application from the command line just fine as I added the proper paths to my environement variables PATH and LD_LIBRARY_PATH in ~/.bashrc. I added the same paths to the ~/.profile file, which, if I'm not mistaken, is supposed to be parsed by Ubuntu. Doesn't work. Nothing. Where can I go from there? EDIT: I logged out/in and restarted my computer. Both didn't change a thing. The problem seems to come from the fact that no matter what I do the LD_LIBRARY_PATH environment variable is not properly passed to Ubuntu. Using log files, I found that the application I'm trying to run in this example doesn't find one it's dependencies located in ~/usr/lib. One solution would be to add the /home/jim/usr/lib folder inside a file located in /etc/ld.so.conf.d/, but I don't have admin rights on this machine. Making a wrapper script like this one works: #!/bin/bash export LD_LIBRARY_PATH=$HLOC/usr/lib application &> $HOME/application_messages.log but that would force me to wrap all my home compiled applications with this script. Any ideas? Why does Ubuntu/Gnome remove the LD_LIBRARY_PATH environment variable from my set variables? Is it because trying to do this is bad practice? UPDATE (and solution): As found by Christopher, there is a bug report about this on launchpad. LD_LIBRARY_PATH is unset after parsing of the ~/.profile file. See the bug report. Seems the only solution for now is to make a wrapper script.

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• How to create a thread in XNA for pathfinding?

  - by Dan

  I am trying to create a separate thread for my enemy's A* pathfinder which will give me a list of points to get to the player. I have placed the thread in the update method of my enemy. However this seems to cause jittering in the game every-time the thread is called. I have tried calling just the method and this works fine. Is there any way I can sort this out so that I can have the pathfinder on its own thread? Do I need to remove the thread start from the update and start it in the constructor? Is there any way this can work? Here is the code at the moment: bool running = false; bool threadstarted; System.Threading.Thread thread; public void update() { if (running == false && threadstarted == false) { thread = new System.Threading.Thread(PathThread); //thread.Priority = System.Threading.ThreadPriority.Lowest; thread.IsBackground = true; thread.Start(startandendobj); //PathThread(startandendobj); threadstarted = true; } } public void PathThread(object Startandend) { object[] Startandendarray = (object[])Startandend; Point startpoint = (Point)Startandendarray[0]; Point endpoint = (Point)Startandendarray[1]; bool runnable = true; // Path find from 255, 255 to 0,0 on the map foreach(Tile tile in Map) { if(tile.Color == Color.Red) { if (tile.Position.Contains(endpoint)) { runnable = false; } } } if(runnable == true) { running = true; Pathfinder p = new Pathfinder(Map); pathway = p.FindPath(startpoint, endpoint); running = false; threadstarted = false; } }

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• Pathfinding with MicroPather : costs calculations with sectors and portals

  - by Adan

  Hello, I'm considering using micropather to help me with pathfinding. I'm not using a discrete map : I'm working in 2d with sectors and portales. However, I'm just wondering what is the best way to compute costs with this library in this context. Just to be more clear about geometrical shapes I'm using : sectors are basically convex polygons, and portals are segments that lies on sector's edge. Micropather exposes a pure virtual Graph class that you must inherate and overrides 3 functions. I understand how pathfinding works, so there's no problem in overriding those functions. Right now, my implementation give me results, i.e I'm able to find a path in my map, but I'm not sure I'm using an optimal solution. For the AdjacentCost method : I just take the distance between sector's centers as the cost. I think a better solution should be to use the portal between the two sectors, compute its center, and then the cost should be : distance( sector A center, portal center ) + distance ( sector B center, portal center ). I'm pretty sure the approximation I'm using with just sector's center is enough for most cases, but maybe with thin and long sectors that are perpendicular, this approximation could mislead the A* algorithm. For the LeastCostEstimate method : I just take the midpoint of the two sectors. So, as you understand, I'm always working with sectors' centers, and it's working fine. And I'm pretty sure there's a better way to work. Any suggestions or feedbacks? Thanks in advance!

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• getting bash to load my PATH over SSH

  - by Eli Bendersky

  This problem comes up with me trying to make svnserve (Subversion server) available on a server through SSH. I compiled SVN and installed it in $HOME/bin. Local access to it (not through SSH) works fine. Connections to svn+ssh fail due to: bash: svnserve: command not found Debugging this, I've found that: ssh user@server "which svnserve" says: which: no svnserve in (/usr/bin:/bin) This is strange, because I've updated the path to $HOME/bin in my .bashrc, and also added it in ~/.ssh/environment. However, it seems like the SSH doesn't read it. Although when I run: ssh user@server "echo $PATH" It does print my updated path! What's going on here? How can I make SSH find my svnserve? Thanks in advance

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• ASP.NET Security Exception when Switch IIS7 to Use UNC Path for Content

  - by Jeremy H.

  I have a Windows Server 2008 R2 box running IIS7.5 with Medium Trust configured for ASP.NET. When I have the website running from local content (e.g.: c:\inetpub\wwwroot) everything works fine. When I change IIS to use a UNC path for the content (e.g.: \\computer\wwwroot) I get the following error: Security Exception Description: The application attempted to perform an operation not allowed by the security policy. To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file. Exception Details: System.Security.SecurityException: Request for the permission of type 'System.Data.SqlClient.SqlClientPermission, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed. I'm trying to figure out why ASP.NET/IIS would allow for the SQL call when using local content but not when using a UNC path. Any ideas what I need to do to use a UNC path from IIS7 properly?

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• Copy a file to a new directory path in DOS

  - by nodmonkey

  How can I copy a file using DOS commands into a directory structure that may not yet exist? I need to be able to force the creation of the directory path to the target file location if that location doesn't already exist. For example, there is already a file.txt in this location: C:\file.txt And I want to copy it to C:\example\new\path\to\copy\of\file\file.txt but at this time C:\example\ and all the subdirectories may or may not yet exist. Basically, I am looking for a "copy and create the target path if necessary" command. What would you recommend is the best way to achieve this?

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• ASP.NET Security Exception when Switch IIS7 to Use UNC Path for Content

  - by Jeremy H.

  I have a Windows Server 2008 R2 box running IIS7.5 with Medium Trust configured for ASP.NET. When I have the website running from local content (e.g.: c:\inetpub\wwwroot) everything works fine. When I change IIS to use a UNC path for the content (e.g.: \\computer\wwwroot) I get the following error: Security Exception Description: The application attempted to perform an operation not allowed by the security policy. To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file. Exception Details: System.Security.SecurityException: Request for the permission of type 'System.Data.SqlClient.SqlClientPermission, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed. I'm trying to figure out why ASP.NET/IIS would allow for the SQL call when using local content but not when using a UNC path. Any ideas what I need to do to use a UNC path from IIS7 properly?

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• (svh+ssh) getting bash to load my PATH over SSH

  - by Eli Bendersky

  This problem comes up with me trying to make svnserve (Subversion server) available on a server through SSH. I compiled SVN and installed it in $HOME/bin. Local access to it (not through SSH) works fine. Connections to svn+ssh fail due to: bash: svnserve: command not found Debugging this, I've found that: ssh user@server "which svnserve" says: which: no svnserve in (/usr/bin:/bin) This is strange, because I've updated the path to $HOME/bin in my .bashrc, and also added it in ~/.ssh/environment. However, it seems like the SSH doesn't read it. Although when I run: ssh user@server "echo $PATH" It does print my updated path! What's going on here? How can I make SSH find my svnserve? Thanks in advance

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• (svn+ssh) getting bash to load my PATH over SSH

  - by Eli Bendersky

  This problem comes up with me trying to make svnserve (Subversion server) available on a server through SSH. I compiled SVN and installed it in $HOME/bin. Local access to it (not through SSH) works fine. Connections to svn+ssh fail due to: bash: svnserve: command not found Debugging this, I've found that: ssh user@server "which svnserve" says: which: no svnserve in (/usr/bin:/bin) This is strange, because I've updated the path to $HOME/bin in my .bashrc, and also added it in ~/.ssh/environment. However, it seems like the SSH doesn't read it. Although when I run: ssh user@server "echo $PATH" It does print my updated path! What's going on here? How can I make SSH find my svnserve? Thanks in advance

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• How to configure sudoers with path wildcards?

  - by C. Lee

  I need sudo for a command for any path under a particular area. Example: sudo mycommand /opt/apps/myapp/... What is the sudoers syntax to allow this command to run in any path that falls under /opt/apps/myapp? This is Solaris 10 sudo. Thank you for your reply, but I don't need wildcards for the path to the commands, but wildcards for the arguments for the commands. For example, we want to do something like... sudo mycmd /opt/userarea/area1 sudo mycmd /opt/userarea/area1/area2 sudo mycmd /opt/userarea/area1/area2/area3 So far, using wildcards for the arguments in sudoers look like this: /opt/userarea/* /opt/userarea/*/* And it seems like if we want to have N levels of directories, then we need N lines in sudoers! Is there a better way to include all N levels in one line in sudoers? Thanks.

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• Change windows default path or last used path for saving files? Is that possible?

  - by Mark

  I'm trying to change the default saving path to my specfied path for example if the file is picture (.jpg .gif etc..) and using google chrome I save an image the path can be anything from default or last used so I want it to be mine specfied for example I choose "C:\SaveHerePics" I don't know how you can change it maybe Registry? Dll? I would like to create vb.net program with textbox you choose the new location to be located every time for example "C:\SaveHerePics" and it should not have anything to do with this program even if you close the program the default location for pictures saved via any program or source saved to "C:\SaveHerePics" Thanks a lot for your help!

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• Relative path reference in WebConfig.ConnectionString

  - by Ngu Soon Hui

  Is it possible to specify a relative path reference in connectionstring, attachDbFileName property in a web.config? For example, In my database is located in the App_data folder, I can easily specify the AttachDBFilename as|DataDirectory|\mydb.mdf and the |Datadirectory| will automatically resolve to the correct path. Now, suppose that web.config file is located in A folder, but the database is located in B\App_data folder, where A and B folder is located in the same folder. Is there anyway to use relative path reference to resolve to the correct path?

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• Do we need seperate file path for window and linux in java

  - by Kishor Sharma

  I have a file on linux ubuntu server hosted with path name /home/kishor/project/detail/. When I made a web app in window to upload and download file from specified location i used path "c:\kishor\projects\detail\" for saving in window. For my surprise when i used window file path name in my server i am still able to get files and upload them, i.e, "c:\kishor\projects\detail\". Can anyone explain why it is working (as window and linux both use different file path pattern).

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• use absolute or relative path?

  - by ajsie

  in my config.php where i have all constants i set the PATH to a absolute path. but this means that when i move my application folder i have to change this path. i wondered if its better to set a relative path, in that way whenever i move my application between production and development folder, i dont have to change it. how do you guys do when you move between folders?

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• sys.path() and PYTHONPATH issues

  - by Justin

  I've been learning Python, I'm working in 2.7.3, and I'm trying to understand import statements. The documentation says that when you attempt to import a module, the interpreter will first search for one of the built-in modules. What is meant by a built-in module? Then, the documentation says that the interpreter searches in the directories listed by sys.path, and that sys.path is initialized from these sources: the directory containing the input script (or the current directory). PYTHONPATH (a list of directory names, with the same syntax as the shell variable PATH). the installation-dependent default. Here is a sample output of a sys.path command from my computer using python in command-line mode: (I deleted a few so that it wouldn't be huge) ['', '/usr/lib/python2.7', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload', '/usr/local/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages/PIL', '/usr/lib/python2.7/dist-packages/gst-0.10', '/usr/lib/python2.7/dist-packages/gtk-2.0', '/usr/lib/pymodules/python2.7', '/usr/lib/python2.7/dist-packages/ubuntuone-couch', '/usr/lib/python2.7/dist-packages/ubuntuone-storage-protocol'] Now, I'm assuming that the '' path refers to the directory containing the 'script', and so I figured the rest of them would be coming from my PYTHONPATH environmental variable. However, when I go to the terminal and type env, PYTHONPATH doesn't exist as an environmental variable. I also tried import os then os.environ, but I get the same output. Do I really not have a PYTHONPATH environmental variable? I don't believe I ever specifically defined a PYTHONPATH environmental variable, but I assumed that when I installed new packages they automatically altered that environment variable. If I don't have a PYTHONPATH, how is my sys.path getting populated? If I download new packages, how does Python know where to look for them if I don't have this PYTHONPATH variable? How do environment variables work? From what I understand, environment variables are specific to the process for which they are set, however, if I open multiple terminal windows and run env, they all display a number of identical variables, for example, PATH. I know there file locations for persistent environment variables, for example /etc/environment, which contains my PATH variable. Is it possible to tell where a persistent environment variable is stored? What is the recommended location for storing new persistent environment variables? How do environment variables actually work with say, the Python interpreter? The Python interpreter looks for PYTHONPATH, but how does it work at the nitty-gritty level?

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• mysql not in my PATH for some reason

  - by Dr.Dredel

  I've installed mysql on several macs and on one of them mysql is not in the path. If I export it it shows up in the path correctly, but upon reboot, disappears. What should I do to get the machine to keep it in the path and what are the machines that DO have it in their path doing differently? Any thoughts appreciated.

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• how to find file's path according to filename?

  - by Phsika

  how to find file's path according to filename? i need to find file's path according to file name sample code: string path= System.IO.Directory.GetDirectories(@"c:\", "kategori",System.IO.SearchOption.AllDirectories).First(); But i need : string path= System.IO.Directory.GetDirectories(@"anyFolder", "kategori",System.IO.SearchOption.AllDirectories).First();

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• Visual C# 2008 Control to set a path.

  - by Eyla

  Greetings, What control in Visual C# 2008 would allow me to set a path and get the value of that path. For example: I want the user to click a button then select a path where he/she would do the operation such as save a file in selected path.

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• vb6 Open File For Append issue Path Not Found

  - by Schwayday

  Open App.Path & "\Folder\" & str(0) For Output Seems to get a path not found however if directly before that I do MsgBox App.Path & "\Folder\" & str(0) It Provides the correct directory/filename that I want and if I replace that string with the direct path in quotes it works fine however that won't be very good for other users of my app :( Anyone know why this doesn't work?

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• hadoop install cluster

  - by chnet

  Is it possible to run hadoop on multi-node and these nodes install hadoop on different paths? I noticed the tutorial, such as Michael Noll's, http://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-multi-node-cluster/, asks hadoop to be installed on different nodes with the same installation path. I tried to run hadoop on multi-node. Each node installed hadoop on different path. But not success. I noticed that the hadoop assume installation paths are the same in default. The problem is when I execute start-dfs.sh it tries to start hadoop deamons on the salve nodes from the same path as on master. "Whereas the installation path is different. Were the relevant files modified to reflect the installed locations on each node"? Which file I should modify to reflect the installed locations on each node?

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• cannot install Komodo IDE

  - by Delirium tremens

  I double-click komodo, but it doesn't run. In the Terminal, I type "echo $PATH", but the Komodo dir isn't there. There too, I type "komodo", but the command isn't found. While trying to install Komodo, I may have typed wrong paths. How to correct $PATH? How to run Komodo? echo $PATH echoes /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games

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• Compiling Ruby on Mac OS X Snow Leopard

  - by gryzzly

  Hi, I am trying to follow this tutorial, on the subject of compiling ruby and rubygems on Snow Leopard: http://hivelogic.com/articles/compiling-ruby-rubygems-and-rails-on-snow-leopard I have added this to my ~/.profile: export PATH="/usr/local/bin:/usr/local/sbin:/usr/local/mysql/bin:$PATH" But if I write: echo $PATH I get: /opt/local/bin:/opt/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/local/git/bin:/usr/X11/bin But in tutorial it says: You should see /usr/local/bin at the beginning of the line returned by the system. I have installed macports sometime ago and plenty of other software, perhaps it has changed the path. Anyway, I have tried to proceed with the installation, so I have built ruby, I did: ./configure --enable-shared --enable-pthread CFLAGS=-D_XOPEN_SOURCE=1 make sudo make install cd .. But when I do which ruby I get: /usr/bin/ruby And according to the tutorial that's wrong. Also if I do ruby -v I get the older version of ruby that was preinstalled on Snow Leopard and not the one I've compiled. Thanks.

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• Changing Java from OpenJDK to SunJava

  - by SpiXel

  I want to change OpenJDK to SunJava in my ubuntu linux desktop , i have downloaded the "jdk-7.tar.gz" from sun's website, but there problem is how to make the system to use the newly downloaded java ? I tried adding the new jdk/bin/java to my PATH ( from .bashrc ) but that seem not to work (cause probably OpenJDK's path is inside my PATH variable as well , so the system checks that first) Here's my JDK7 : /usr/lib/jdk7/bin/java Here's what $(which java) outputs : /usr/bin/java Thanks in advance

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• Fastest pathfinding for static node matrix

  - by Sean Martin

  I'm programming a route finding routine in VB.NET for an online game I play, and I'm searching for the fastest route finding algorithm for my map type. The game takes place in space, with thousands of solar systems connected by jump gates. The game devs have provided a DB dump containing a list of every system and the systems it can jump to. The map isn't quite a node tree, since some branches can jump to other branches - more of a matrix. What I need is a fast pathfinding algorithm. I have already implemented an A* routine and a Dijkstra's, both find the best path but are too slow for my purposes - a search that considers about 5000 nodes takes over 20 seconds to compute. A similar program on a website can do the same search in less than a second. This website claims to use D*, which I have looked into. That algorithm seems more appropriate for dynamic maps rather than one that does not change - unless I misunderstand it's premise. So is there something faster I can use for a map that is not your typical tile/polygon base? GBFS? Perhaps a DFS? Or have I likely got some problem with my A* - maybe poorly chosen heuristics or movement cost? Currently my movement cost is the length of the jump (the DB dump has solar system coordinates as well), and the heuristic is a quick euclidean calculation from the node to the goal. In case anyone has some optimizations for my A*, here is the routine that consumes about 60% of my processing time, according to my profiler. The coordinateData table contains a list of every system's coordinates, and neighborNode.distance is the distance of the jump. Private Function findDistance(ByVal startSystem As Integer, ByVal endSystem As Integer) As Integer 'hCount += 1 'If hCount Mod 0 = 0 Then 'Return hCache 'End If 'Initialize variables to be filled Dim x1, x2, y1, y2, z1, z2 As Integer 'LINQ queries for solar system data Dim systemFromData = From result In jumpDataDB.coordinateDatas Where result.systemId = startSystem Select result.x, result.y, result.z Dim systemToData = From result In jumpDataDB.coordinateDatas Where result.systemId = endSystem Select result.x, result.y, result.z 'LINQ execute 'Fill variables with solar system data for from and to system For Each solarSystem In systemFromData x1 = (solarSystem.x) y1 = (solarSystem.y) z1 = (solarSystem.z) Next For Each solarSystem In systemToData x2 = (solarSystem.x) y2 = (solarSystem.y) z2 = (solarSystem.z) Next Dim x3 = Math.Abs(x1 - x2) Dim y3 = Math.Abs(y1 - y2) Dim z3 = Math.Abs(z1 - z2) 'Calculate distance and round 'Dim distance = Math.Round(Math.Sqrt(Math.Abs((x1 - x2) ^ 2) + Math.Abs((y1 - y2) ^ 2) + Math.Abs((z1 - z2) ^ 2))) Dim distance = firstConstant * Math.Min(secondConstant * (x3 + y3 + z3), Math.Max(x3, Math.Max(y3, z3))) 'Dim distance = Math.Abs(x1 - x2) + Math.Abs(z1 - z2) + Math.Abs(y1 - y2) 'hCache = distance Return distance End Function And the main loop, the other 30% 'Begin search While openList.Count() != 0 'Set current system and move node to closed currentNode = lowestF() move(currentNode.id) For Each neighborNode In neighborNodes If Not onList(neighborNode.toSystem, 0) Then If Not onList(neighborNode.toSystem, 1) Then Dim newNode As New nodeData() newNode.id = neighborNode.toSystem newNode.parent = currentNode.id newNode.g = currentNode.g + neighborNode.distance newNode.h = findDistance(newNode.id, endSystem) newNode.f = newNode.g + newNode.h newNode.security = neighborNode.security openList.Add(newNode) shortOpenList(OLindex) = newNode.id OLindex += 1 Else Dim proposedG As Integer = currentNode.g + neighborNode.distance If proposedG < gValue(neighborNode.toSystem) Then changeParent(neighborNode.toSystem, currentNode.id, proposedG) End If End If End If Next 'Check to see if done If currentNode.id = endSystem Then Exit While End If End While If clarification is needed on my spaghetti code, I'll try to explain.

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• Is my implementation of A* wrong?

  - by Bloodyaugust

  I've implemented the A* algorithm in my program. However, it would seem to be functioning incorrectly at times. Below is a screenshot of one such time. The obviously shorter line is to go immediately right at the second to last row. Instead, they move down, around the tower, and continue to their destination (bottom right from top left). Below is my actual code implementation: nodeMap.prototype.findPath = function(p1, p2) { var openList = []; var closedList = []; var nodes = this.nodes; for (var i = 0; i < nodes.length; i++) { //reset heuristics and parents for nodes var curNode = nodes[i]; curNode.f = 0; curNode.g = 0; curNode.h = 0; curNode.parent = null; if (curNode.pathable === false) { closedList.push(curNode); } } openList.push(this.getNode(p1)); while(openList.length > 0) { // Grab the lowest f(x) to process next var lowInd = 0; for(i=0; i<openList.length; i++) { if(openList[i].f < openList[lowInd].f) { lowInd = i; } } var currentNode = openList[lowInd]; if (currentNode === this.getNode(p2)) { var curr = currentNode; var ret = []; while(curr.parent) { ret.push(curr); curr = curr.parent; } return ret.reverse(); } closedList.push(currentNode); for (i = 0; i < openList.length; i++) { //remove currentNode from openList if (openList[i] === currentNode) { openList.splice(i, 1); break; } } for (i = 0; i < currentNode.neighbors.length; i++) { if(closedList.indexOf(currentNode.neighbors[i]) !== -1 ) { continue; } if (currentNode.neighbors[i].isPathable === false) { closedList.push(currentNode.neighbors[i]); continue; } var gScore = currentNode.g + 1; // 1 is the distance from a node to it's neighbor var gScoreIsBest = false; if (openList.indexOf(currentNode.neighbors[i]) === -1) { //save g, h, and f then save the current parent gScoreIsBest = true; currentNode.neighbors[i].h = currentNode.neighbors[i].heuristic(this.getNode(p2)); openList.push(currentNode.neighbors[i]); } else if (gScore < currentNode.neighbors[i].g) { //current g better than previous g gScoreIsBest = true; } if (gScoreIsBest) { currentNode.neighbors[i].parent = currentNode; currentNode.neighbors[i].g = gScore; currentNode.neighbors[i].f = currentNode.neighbors[i].g + currentNode.neighbors[i].h; } } } return false; } Towers block pathability. Is there perhaps something I am missing here, or does A* not always find the shortest path in a situation such as this? Thanks in advance for any help.

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