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• What's the equivalent of the "cls" command from Windows/DOS?

  - by blade19899

  I used to use cmd back in windows and the command line a used a lot was cls. It's kind of like the clear command in Linux but it cleans the screen permanently. If you use the clear command it just scroll down so that you don't see the command you where working on. I like both a lot but my question is how do i get a cls like command that clears the screen and can't browse up to see the command you where working on?

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• How can I use my keyboard as a mouse?

  - by Michael Durrant

  I'm using my keyboard more and more these days for basic command line stuff, vim editing, alt-tab window switching and the like. Q) How can I use my number pad keys to move the cursor around on the screen without using the mouse? I looked to try and install btnx as mentioned by others but it doesn't seem to exist anymore as an available package I also tried shift-numlock as mentioned by another but that didn't work either (just turns numlock on/off).

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• ipheth notification at login prompt

  - by spudwaffle

  On my command line only Ubuntu machine, the login prompt occasionally shows a warning: Ubuntu 12.04 LTS myserver tty1 myserver login: [833747.589882] ipheth: ipheth_rcvbulk_callback: urb status: -71 Nothing is obviously wrong with the system, and I can enter my username and password without issue. What does this message mean and should I be worried about it? Edit: I've found plugging in and then removing my iPhone from the computer causes this message. I'm still looking for what it means.

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• What do each of the TTYs do?

  - by david25

  I know that alt+ctrl+F(1-6) take me to available command lines, and that F1 command line is used for debugging, and F8 is the GUI desktop, that what i know but today i noticed there in F7 that does nothing, it only displays some sort of log in message, and there is F(9-12) that just display black screen with blinking under scroll . can anyone enlighten me what those consoles do, are they for trouble shooting maybe? i use ubuntu netbook 10.10.

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• How can I get a complete list of non-standard repositories in use?

  - by MagicFab

  While doing some support audits I'd like to know what would be the most efficient/compact way to get a list of all extra reporitories being used on a given Ubuntu workstation using command line (not via the GUI tools). So far I am using: diff'ing a standard sources.list file against the workstation's examining files under cat /etc/apt/sources.list.d Any other ideas on how to best go about this ?

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• Help understanding the migrate wubi documentation?

  - by user110259

  I'm looking at the MigrateWubi page but I'm not sure if I need to change the partition directories to the ones I created, and if so, I'm not too sure which ones I need to change. Here are the partitions I've made: Should I just copy and paste: sudo bash wubi-move.sh /dev/sda5 /dev/sda6 into my terminal or something else? Also, do I enter just this one line or do i need to enter any other commands in there? Thanks!

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• configuring and authenticating proxy on ubuntu 12.04 terminal

  - by awuni joshua

  I am very new to ubuntu, I decided to try it out two days ago. I am using proxy server [41.74.91.139 with user name and password]. I cant access any on-line resources both with the terminal, transmission(to download torrents), or Ubuntu software center. For firefox, I have configured it and can download .deb and other files but need direct access. Please give me step by step instruction as to how to configure and authenticate 12.04 terminal. Thank you

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• Red Hat Yum not working out of the box?

  - by Tucker

  I have a server runnning Red Hat Enterprise Linux v5.6 in the cloud. My project constraints do not allow me to use another OS. When I created the cloud server, I was able to SSH into it and access the shell. I next ran the command: sudo yum update But the command failed. About a month ago I created another server with the same machine image and didn't have that error. Why is it failing now? The following is the terminal output sudo yum update Loaded plugins: security Repository rhel-server is listed more than once in the configuration Traceback (most recent call last): File "/usr/bin/yum", line 29, in ? yummain.user_main(sys.argv[1:], exit_code=True) File "/usr/share/yum-cli/yummain.py", line 309, in user_main errcode = main(args) File "/usr/share/yum-cli/yummain.py", line 178, in main result, resultmsgs = base.doCommands() File "/usr/share/yum-cli/cli.py", line 345, in doCommands self._getTs(needTsRemove) File "/usr/lib/python2.4/site-packages/yum/depsolve.py", line 101, in _getTs self._getTsInfo(remove_only) File "/usr/lib/python2.4/site-packages/yum/depsolve.py", line 112, in _getTsInfo pkgSack = self.pkgSack File "/usr/lib/python2.4/site-packages/yum/__init__.py", line 662, in <lambda> pkgSack = property(fget=lambda self: self._getSacks(), File "/usr/lib/python2.4/site-packages/yum/__init__.py", line 502, in _getSacks self.repos.populateSack(which=repos) File "/usr/lib/python2.4/site-packages/yum/repos.py", line 260, in populateSack sack.populate(repo, mdtype, callback, cacheonly) File "/usr/lib/python2.4/site-packages/yum/yumRepo.py", line 168, in populate if self._check_db_version(repo, mydbtype): File "/usr/lib/python2.4/site-packages/yum/yumRepo.py", line 226, in _check_db_version return repo._check_db_version(mdtype) File "/usr/lib/python2.4/site-packages/yum/yumRepo.py", line 1233, in _check_db_version repoXML = self.repoXML File "/usr/lib/python2.4/site-packages/yum/yumRepo.py", line 1406, in <lambda> repoXML = property(fget=lambda self: self._getRepoXML(), File "/usr/lib/python2.4/site-packages/yum/yumRepo.py", line 1398, in _getRepoXML self._loadRepoXML(text=self) File "/usr/lib/python2.4/site-packages/yum/yumRepo.py", line 1388, in _loadRepoXML return self._groupLoadRepoXML(text, ["primary"]) File "/usr/lib/python2.4/site-packages/yum/yumRepo.py", line 1372, in _groupLoadRepoXML if self._commonLoadRepoXML(text): File "/usr/lib/python2.4/site-packages/yum/yumRepo.py", line 1208, in _commonLoadRepoXML result = self._getFileRepoXML(local, text) File "/usr/lib/python2.4/site-packages/yum/yumRepo.py", line 989, in _getFileRepoXML cache=self.http_caching == 'all') File "/usr/lib/python2.4/site-packages/yum/yumRepo.py", line 826, in _getFile http_headers=headers, File "/usr/lib/python2.4/site-packages/urlgrabber/mirror.py", line 412, in urlgrab return self._mirror_try(func, url, kw) File "/usr/lib/python2.4/site-packages/urlgrabber/mirror.py", line 398, in _mirror_try return func_ref( *(fullurl,), **kwargs ) File "/usr/lib/python2.4/site-packages/urlgrabber/grabber.py", line 936, in urlgrab return self._retry(opts, retryfunc, url, filename) File "/usr/lib/python2.4/site-packages/urlgrabber/grabber.py", line 854, in _retry r = apply(func, (opts,) + args, {}) File "/usr/lib/python2.4/site-packages/urlgrabber/grabber.py", line 922, in retryfunc fo = URLGrabberFileObject(url, filename, opts) File "/usr/lib/python2.4/site-packages/urlgrabber/grabber.py", line 1010, in __init__ self._do_open() File "/usr/lib/python2.4/site-packages/urlgrabber/grabber.py", line 1093, in _do_open fo, hdr = self._make_request(req, opener) File "/usr/lib/python2.4/site-packages/urlgrabber/grabber.py", line 1202, in _make_request fo = opener.open(req) File "/usr/lib64/python2.4/urllib2.py", line 358, in open response = self._open(req, data) File "/usr/lib64/python2.4/urllib2.py", line 376, in _open '_open', req) File "/usr/lib64/python2.4/urllib2.py", line 337, in _call_chain result = func(*args) File "/usr/lib64/python2.4/site-packages/M2Crypto/m2urllib2.py", line 82, in https_open h.request(req.get_method(), req.get_selector(), req.data, headers) File "/usr/lib64/python2.4/httplib.py", line 810, in request self._send_request(method, url, body, headers) File "/usr/lib64/python2.4/httplib.py", line 833, in _send_request self.endheaders() File "/usr/lib64/python2.4/httplib.py", line 804, in endheaders self._send_output() File "/usr/lib64/python2.4/httplib.py", line 685, in _send_output self.send(msg) File "/usr/lib64/python2.4/httplib.py", line 652, in send self.connect() File "/usr/lib64/python2.4/site-packages/M2Crypto/httpslib.py", line 47, in connect self.sock.connect((self.host, self.port)) File "/usr/lib64/python2.4/site-packages/M2Crypto/SSL/Connection.py", line 174, in connect ret = self.connect_ssl() File "/usr/lib64/python2.4/site-packages/M2Crypto/SSL/Connection.py", line 167, in connect_ssl return m2.ssl_connect(self.ssl, self._timeout) M2Crypto.SSL.SSLError: certificate verify failed

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• Some questions about line-height.........

  - by metal-gear-solid

  what is default line-height of browsers like font-size is 16px? for which HTML elements i should define line-height and for which not? What is the reason behind to give line-height to body { } ? Will line-height effect to single line text? If I'm using font in em then should i also use use line-height in em? What is co-relation between line-height and font-size?

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• Inserting text in a particular line of a textbox in .Net

  - by mouthpiec

  Hi, I would like to insert text in a particular line, and replacing the text in the same line. Eg This is line 1 This is line 2 This is line 3 Now i would like to replace the text in line 2 to this is new line 2 is this possible?

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• In the Firing Line: The impact of project and portfolio performance on the CEO

  - by Melissa Centurio Lopes

  Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} What are the primary measurements for rating CEO performance? For corporate boards, business analysts, investors, and the trade press the metrics they deploy are relatively binary in nature; what is being done to generate earnings, and what is being done to build and sustain high performance? As for the market, interest is primarily aroused when operational and financial performance falls outside planned commitments for the year. When organizations announce better than predicted results, they usually experience an immediate increase in share price. Likewise, poor results have an obviously negative impact on the share price and impact the role and tenure of the incumbent CEO. The danger for the CEO is that the risk of failure is ever present, ranging from manufacturing delays and supply chain issues to labor shortages and scope creep. This risk is enhanced by the involvement of secondary suppliers providing services critical to overall work schedules, and magnified further across a portfolio of programs and projects underway at any one time – and all set within a global context. All can impact planned return on investment and have an inevitable impact on the share price – the primary empirical measure of day-to-day performance. Read this complete complementary report, In the Firing Line and explore what is the direct link between the health of the portfolio and CEO performance. This report will provide an overview of the responsibility the CEO has for implementing and maintaining a culture of accountability, offer examples of some of the higher profile project failings in recent years, and detail the capabilities available to the CEO to mitigate the risks residing in their own portfolios. Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;}

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• Finding the heaviest length-constrained path in a weighted Binary Tree

  - by Hristo

  UPDATE I worked out an algorithm that I think runs in O(n*k) running time. Below is the pseudo-code: routine heaviestKPath( T, k ) // create 2D matrix with n rows and k columns with each element = -8 // we make it size k+1 because the 0th column must be all 0s for a later // function to work properly and simplicity in our algorithm matrix = new array[ T.getVertexCount() ][ k + 1 ] (-8); // set all elements in the first column of this matrix = 0 matrix[ n ][ 0 ] = 0; // fill our matrix by traversing the tree traverseToFillMatrix( T.root, k ); // consider a path that would arc over a node globalMaxWeight = -8; findArcs( T.root, k ); return globalMaxWeight end routine // node = the current node; k = the path length; node.lc = node’s left child; // node.rc = node’s right child; node.idx = node’s index (row) in the matrix; // node.lc.wt/node.rc.wt = weight of the edge to left/right child; routine traverseToFillMatrix( node, k ) if (node == null) return; traverseToFillMatrix(node.lc, k ); // recurse left traverseToFillMatrix(node.rc, k ); // recurse right // in the case that a left/right child doesn’t exist, or both, // let’s assume the code is smart enough to handle these cases matrix[ node.idx ][ 1 ] = max( node.lc.wt, node.rc.wt ); for i = 2 to k { // max returns the heavier of the 2 paths matrix[node.idx][i] = max( matrix[node.lc.idx][i-1] + node.lc.wt, matrix[node.rc.idx][i-1] + node.rc.wt); } end routine // node = the current node, k = the path length routine findArcs( node, k ) if (node == null) return; nodeMax = matrix[node.idx][k]; longPath = path[node.idx][k]; i = 1; j = k-1; while ( i+j == k AND i < k ) { left = node.lc.wt + matrix[node.lc.idx][i-1]; right = node.rc.wt + matrix[node.rc.idx][j-1]; if ( left + right > nodeMax ) { nodeMax = left + right; } i++; j--; } // if this node’s max weight is larger than the global max weight, update if ( globalMaxWeight < nodeMax ) { globalMaxWeight = nodeMax; } findArcs( node.lc, k ); // recurse left findArcs( node.rc, k ); // recurse right end routine Let me know what you think. Feedback is welcome. I think have come up with two naive algorithms that find the heaviest length-constrained path in a weighted Binary Tree. Firstly, the description of the algorithm is as follows: given an n-vertex Binary Tree with weighted edges and some value k, find the heaviest path of length k. For both algorithms, I'll need a reference to all vertices so I'll just do a simple traversal of the Tree to have a reference to all vertices, with each vertex having a reference to its left, right, and parent nodes in the tree. Algorithm 1 For this algorithm, I'm basically planning on running DFS from each node in the Tree, with consideration to the fixed path length. In addition, since the path I'm looking for has the potential of going from left subtree to root to right subtree, I will have to consider 3 choices at each node. But this will result in a O(n*3^k) algorithm and I don't like that. Algorithm 2 I'm essentially thinking about using a modified version of Dijkstra's Algorithm in order to consider a fixed path length. Since I'm looking for heaviest and Dijkstra's Algorithm finds the lightest, I'm planning on negating all edge weights before starting the traversal. Actually... this doesn't make sense since I'd have to run Dijkstra's on each node and that doesn't seem very efficient much better than the above algorithm. So I guess my main questions are several. Firstly, do the algorithms I've described above solve the problem at hand? I'm not totally certain the Dijkstra's version will work as Dijkstra's is meant for positive edge values. Now, I am sure there exist more clever/efficient algorithms for this... what is a better algorithm? I've read about "Using spine decompositions to efficiently solve the length-constrained heaviest path problem for trees" but that is really complicated and I don't understand it at all. Are there other algorithms that tackle this problem, maybe not as efficiently as spine decomposition but easier to understand? Thanks.

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• How to get current datetime on windows command line, in a suitable format for using in a filename?

  - by Rory

  What's a windows command line statement(s) I can use to get the current datetime in a format that I can put into a filename? I want to have a .bat file that zips up a directory into an archive with the current date & time as part of the name, eg "Code_2008-10-14_2257.zip". Is there any easy way I can do this, independent of the regional settings of the machine? I don't really mind about the date format, ideally it'd be yyyy-mm-dd but anything simple is fine. So far I've got this, which on my machine gives me "Tue_10_14_2008_230050_91" rem Get the datetime in a format that can go in a filename. set _my_datetime=%date%_%time% set _my_datetime=%_my_datetime: =_% set _my_datetime=%_my_datetime::=% set _my_datetime=%_my_datetime:/=_% set _my_datetime=%_my_datetime:.=_% rem now use the timestamp by in a new zip file name "d:\Program Files\7-Zip\7z.exe" a -r Code_%_my_datetime%.zip Code I can live with this but it seems a bit clunky. Ideally it'd be briefer and have the format mentioned earlier. I'm using Windows Server 2003 and Win XP Pro. I don't want to install additional utilities to achieve this (although I realise there are some that will do nice date formatting).

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• How come drawing this line at (0,0) doesn't really draw it at (0,0)?

  - by George Edison

  I have this ActionScript code here: package { import flash.display.Sprite; import flash.display.LineScaleMode; import flash.display.CapsStyle; import flash.display.JointStyle; import flash.display.Shape; import flash.events.Event; public class Main extends Sprite { private var lines:Shape; public function Main():void { if (stage) init(); else addEventListener(Event.ADDED_TO_STAGE, init); } private function init(e:Event = null):void { removeEventListener(Event.ADDED_TO_STAGE, init); // entry point lines = new Shape(); addChild(lines); lines.graphics.clear(); lines.graphics.lineStyle(10, 0x000000); lines.graphics.moveTo(0, 0); lines.graphics.lineTo(stage.stageWidth, stage.stageHeight); } } } What I'm expecting this to do is to draw a line from one corner of the screen to the other... but that's not what it does. See here.

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• Why doesn't JFreeCharts correctly connect the points in my xy-line graph?

  - by Javajava

  /Each letter A,T,G,C represents a direction for the plot to graph. Specifically, “A” means move right, “T” is move down, “C” is move up, and “G” is move left. When the applet reads A,T,C, it plots the graph correctly. However, when I plot G, the graph is messed up. When I input "ACACACA," the graph is like a rising staircase. When I input "gtgtgt," the graph should look like a staircase, but it looks like a lightning bolt instead/ /This is all one code... i don't know why it's all split up like this:/ import java.applet.Applet; import java.awt.*; import java.awt.event.*; import java.util.Scanner.*; import java.jfree.chart.*; import java.jfree.data.xy.*; import java.jfree.chart.plot.PlotOrientation; public class If_Graph extends Applet implements ActionListener{ Panel panel; TextArea textarea, outputArea; Button move; String thetext; Scanner reader = new Scanner(System.in); String thetext2; int size,p,q; int x,y; public void init(){ setSize(500,500); //set size of applet panel = new Panel(); add(panel); setVisible(true); textarea= new TextArea(10,20); add(textarea); move=new Button("Graph"); move.addActionListener(this); add(move); } public void actionPerformed(ActionEvent e) { XYSeries series = new XYSeries("DNA Walk"); x= 0; y = 0; series.add(x,y); if(e.getSource() == move) { thetext=textarea.getText(); //the text is the DNA bases pasted thetext=thetext.replaceAll(" ",""); //removes spaces thetext2 = ""; for(int i=0; i<thetext.length(); i++) { char a = thetext.charAt(i); switch (a) { case 'A': //moves right x+=1; y+=0; series.add(x,y); break; case 'a': x+=1;y+=0; series.add(x,y); break; case 'C': //moves up x+=0; y+=1; series.add(x,y); break; case 'c': x+=0; y+=1; System.out.println(x + "," + y); series.add(x,y); break; case 'G': //move left x-=1; y+=0; series.add(x,y); System.out.println("G is: "+ x +"," +y); break; case 'g': x-=1; y+=0; System.out.println("g is: " +x + "," + y); series.add(x,y); break; case 'T': //move down x+=0; y-=1; series.add(x,y); System.out.println("T is: "+ x +"," +y); break; case 't': x+=0; y-=1; series.add(x,y); System.out.println("t is: "+ x +"," +y); break; default: // series.add(0,0); break; } } XYDataset xyDataset = new XYSeriesCollection(series); JFreeChart chart = ChartFactory.createXYLineChart ("DNA Random Walk", "", "", xyDataset, PlotOrientation.VERTICAL, true, true, false); ChartFrame frame1=new ChartFrame("DNA Random Walk",chart); frame1.setVisible(true); frame1.setSize(300,300); outputArea.setText(thetext2); } } }

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• Shared secret length limit on OSX VPN client

  - by Samuel

  I'm trying to setup the built-in VPN client with OS X. The settings I'm using (IPsec GW, shared secret, etc...) work flawlessly using other clients (IPsecuritas, vpnc, etc...) but isn't working with the built-in client. The error I get is: Wrong shared secret (not the exact message, since OS X is localized) The shared secret is 128 chars long so I'm wondering if it's hitting a length limit. I would like to know if that's true, and if so, how I could overcome it?

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• Breaking the Outlook 2010 e-mail blue quote line for inline responses

  - by Jez

  This has to be the most infuriating regression from Outlook 2003 to 2007. It also exists the same in Outlook 2010, as far as I can tell. When you reply to an HTML e-mail message in Outlook, the quoted text has a blue line down the side, and is usually at the bottom of the message: Now in Outlook 2003, when replying to HTML-formatted messages in Outlook, you used to be able to reply inline quite easily, by getting to the point in the quoted message you wanted to reply to, and pressing the 'decrease indent' button: Since Outlook 2007 (and 2010), they replaced the e-mail editor with Microsoft Word. This means the blue line is implemented in a different way; it uses a blue left border. This makes it tougher to break the line up. After much ado, I found a couple of pages that said that you could remove all formatting by pressing ctrl-Q, which would remove the blue line next to the cursor and allow inline replies: OK, not too bad on the face of it. I can live with that. But here's the kick in the teeth; try sending that mail. I'll send it to myself. What do I receive? This: Outlook 2010 reinstated the blue line, where I had removed it, upon my sending the e-mail! For God's sake! The two pages I linked to above don't seem to address Outlook's reinstating of the blue line upon sending. So, does anyone know how you can actually reply inline in Outlook 2010 (or Outlook 2007) e-mail without the blue line being reinstated? Before anyone says, I do not want to convert the message to plaintext, and I do not want to just indent replies and have to manually build the blue line myself. I want something like the Outlook 2003 behaviour; I reply, Outlook creates the blue line, and I can break it up with inline replies, send it, and my inline formatting stays. My hopes aren't high - Microsoft seem to have gone to some trouble to actively prevent inline replies here, for some reason - but I'd appreciate anyone's insights. Cheers!

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• Trimming article length in Google Reader

  - by Dov

  I'm considering switching to Google Reader from Safari's RSS reader. One feature that I would absolutely miss from Safari is its Article Length slider it gives you for each feed, so you can choose to show more or less content. Is there any way to achieve this in Google Reader's Expanded view? PS I also posted this question on Google's Help forum here.

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• debconf-set-selections warnings Kubuntu 10.04

  - by Buzz

  Hi all! i'm trying to save the content of the debconf database with debconf-get-selections when i use debconf-set-selections i get some warnings warning: Unknown type terminal, skipping line 19 warning: Unknown type error, skipping line 37 warning: Unknown type error, skipping line 83 warning: Unknown type error, skipping line 85 warning: Unknown type error, skipping line 111 warning: Unknown type error, skipping line 156 warning: Unknown type detect-keyboard, skipping line 182 warning: Unknown type error, skipping line 197 warning: Unknown type error, skipping line 234 warning: Unknown type error, skipping line 251 warning: Unknown type error, skipping line 253 warning: Unknown type error, skipping line 259 warning: Unknown type error, skipping line 268 warning: Unknown type error, skipping line 292 warning: Unknown type error, skipping line 306 warning: Unknown type error, skipping line 341 warning: Unknown type error, skipping line 342 warning: Unknown type error, skipping line 343 warning: Unknown type error, skipping line 374 warning: Unknown type error, skipping line 394 warning: Unknown type error, skipping line 396 warning: Unknown type error, skipping line 397 what can be the problem? Thanks

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• Line Numbering in Notepad-Week 41

  - by OWScott

  You can find this week’s video here. Notepad is so simple, yet so useful. Yet, at times the "Go To" appears to break and doesn't work as expected. This week's video is short and sweet. Learn about line numbering in notepad. One of my all-time favorite applications is notepad. You may think I’m joking, but I’ve grown quite fond of notepad over the years. Like a faithful friend, always there for you when you need it. Whether it’s an old computer or new, it opens instantly. I can’t remember notepad ever crashing. Wish I could say that for most other applications. This week’s lesson is a quick one, but if you’ve ever run into issues with line numbering in notepad, I hope you find it useful. I remember the first time the “Go To” feature didn’t work in notepad for me. It took me a while to figure it out so I hope to save you the grief that I went through. Watch this week’s video for a couple quick tips on the tried and true notepad. This is now week 41 of a 52 week series for the web pro. You can view past and future weeks here: http://dotnetslackers.com/projects/LearnIIS7/ You can find this week’s video here.

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• Stupid Geek Tricks: Change Your IP Address From the Command Line in Linux

  - by Taylor Gibb

  Almost everybody can figure out how to change their IP address using an interface, but did you know you can set your network card’s IP address using a simple command from the command line? Changing Your IP From the Command Line in Linux Note: This will work on all Debian based Linux Distro’s. To get started type ifconfig into the terminal and hit enter, take note of the name of the interface that you want to change the settings for. To change the settings, you also use the ifconfig command, this time with a few parameters: sudo ifconfig eth0   192.168.0.1 netmask 255.255.255.0 That’s about all all you need to do to change your IP, of course the above command assumes a few things: The interface that you want to change the IP for is eth0 The IP you want to give the interface is 192.168.0.1 The Subnet Mask you want to set for the interface is 255.255.255.0 If you run ifconfig again you will see that your interface has now taken on the new settings you assigned to it. If you wondering how to change the Default Gateway, you can use the route command. sudo route add default gw 192.168.0.253 eth0 Will set your Default Gateway on the eth0 interface to 192.168.0.253. To see your new setting, you will need to display the routing table. route -n That’s all there is to it. How to Play Classic Arcade Games On Your PC How to Use an Xbox 360 Controller On Your Windows PC Download the Official How-To Geek Trivia App for Windows 8

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• Record 8 separate Line IN Channels from M-Audio Delta 1010 Card

  - by Peter Hoffmann

  I want to record the 8 separate Line IN Channels from my M-Audio Delta 1010 Card. The card is recogniced nicely and a can record a single channel via arecord -d 10 -f cd -t wav -D channel1 out2.wav. I've set up the different channels in ~/.asoundrc. Now if I want to record a second channel in parallel (arecord -d 10 -f cd -t wav -D channel2 out2.wav) I get the error arecord: main:564: audio open error: Device or resource busy As I understand the delta 1010 is a single Access Card, so only one application can access it at a time. Is this correct? The next step was to configure a dual channel input in .asoundrc # envy24 channel 1+2 only pcm.test { type plug ttable.0.0 1 ttable.0.1 1 slave.pcm ice1712 } Which works ok when I do a arecord -d 10 -f cd -t wav -D test -c 2 out.wav (BTW can anyone point me to a tool to split a multi channel wav into a file per channel?) But when I want to record the channels separately with (-I option) arecord -d 10 -f cd -t wav -D test -c 2 -I channel1.wav channel2.wav I get no recordings. Did I miss something with the configuration or what are my options to record all 8 channels via arecord. I've no experience with jackd. Is it an option to install jackd and record the line ins via jackd?

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• 10.10 boots to command line login prompt

  - by greggory.hz

  I recently installed Ubuntu 10.10 on a computer that was previously running 10.04 (that worked fine). Now, each time I boot up, it starts up in a command line login prompt. I can login and it stays at the command line (as expected). I can then manually start gdm with sudo start gdm and it works fine. I can also enable compiz (using proprietary nvidia drivers) so I'm reasonably confident that it's not a driver problem (at least not in the sense that the drivers just flat out aren't working). Interestingly, if I leave it at the command prompt without logging in, after about 5 or 10 minutes, gnome starts up on its own. I'm not sure what is causing this. This is what dmesg | tail gives me after a manual start of gdm: [ 15.664166] NVRM: loading NVIDIA UNIX x86_64 Kernel Module 270.18 Tue Jan 18 21:46:26 PST 2011 [ 15.991304] type=1400 audit(1297543976.953:11): apparmor="STATUS" operation="profile_load" name="/usr/share/gdm/guest-session/Xsession" pid=990 comm="apparmor_parser" [ 16.606986] eth0: link up, 100Mbps, full-duplex, lpa 0xCDE1 [ 18.798506] EXT4-fs (sda1): re-mounted. Opts: errors=remount-ro,commit=0 [ 26.740010] eth0: no IPv6 routers present [ 90.444593] EXT4-fs (sda1): re-mounted. Opts: errors=remount-ro,commit=0 [ 189.252208] audit_printk_skb: 21 callbacks suppressed [ 189.252213] type=1400 audit(1297544150.218:19): apparmor="STATUS" operation="profile_replace" name="/usr/lib/cups/backend/cups-pdf" pid=1876 comm="apparmor_parser" [ 189.252584] type=1400 audit(1297544150.218:20): apparmor="STATUS" operation="profile_replace" name="/usr/sbin/cupsd" pid=1876 comm="apparmor_parser" [ 351.159585] lo: Disabled Privacy Extensions

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• Video game "Gish" will only launch from command line

  - by aberration

  Platform: Lubuntu 11.10 x64 Program: Gish When I try to launch Gish from the command line (/opt/gish/gi.sh), there are no problems. But when I try to launch it from the LXDE menu, it will not start. Contents of /usr/share/applications/gish.desktop: [Desktop Entry] Categories=Game;ActionGame;AdventureGame;ArcadeGame; Exec=/opt/gish/gi.sh Path=/opt/gish Icon=x-gish Terminal=false Type=Application Name=Gish I tried changing Terminal=false to Terminal=true to debug it, but then I just got a blank terminal, and the game didn't start. Edit: Here is some additional information, as requested by Eliah Kagan below: I tried editing /usr/share/applications/gish.desktop, as recommended, but it had no effect However, ~/.xsession-errors contained the following error: [: 8: x86_64: unexpected operator ./gish_32: error while loading shared libraries: libGL.so.1: wrong ELF class: ELFCLASS64 I think there's a problem with the /opt/gish/gi.sh shell script. This is its contents: cd /opt/gish/ MACHINE_TYPE=`uname -m` if [ ${MACHINE_TYPE} == 'x86_64' ]; then ./gish_64 else ./gish_32 fi I'm not too familiar with Bash, so hopefully someone else can point out the error. I have a 64-bit machine. I think that when the script is run from the command line, it's properly launching the 64-bit version (/opt/gish/gish_64), but when it's run from the LXDE menu, it's launching the 32-bit version (/opt/gish/gish_32), which is causing the libGL.so.1 error. However, this may be related to my libGL.so.1 problems with 2 other games.

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• Optimized algorithm for line-sphere intersection in GLSL

  - by fernacolo

  Well, hello then! I need to find intersection between line and sphere in GLSL. Right now my solution is based on Paul Bourke's page and was ported to GLSL this way: // The line passes through p1 and p2: vec3 p1 = (...); vec3 p2 = (...); // Sphere center is p3, radius is r: vec3 p3 = (...); float r = ...; float x1 = p1.x; float y1 = p1.y; float z1 = p1.z; float x2 = p2.x; float y2 = p2.y; float z2 = p2.z; float x3 = p3.x; float y3 = p3.y; float z3 = p3.z; float dx = x2 - x1; float dy = y2 - y1; float dz = z2 - z1; float a = dx*dx + dy*dy + dz*dz; float b = 2.0 * (dx * (x1 - x3) + dy * (y1 - y3) + dz * (z1 - z3)); float c = x3*x3 + y3*y3 + z3*z3 + x1*x1 + y1*y1 + z1*z1 - 2.0 * (x3*x1 + y3*y1 + z3*z1) - r*r; float test = b*b - 4.0*a*c; if (test >= 0.0) { // Hit (according to Treebeard, "a fine hit"). float u = (-b - sqrt(test)) / (2.0 * a); vec3 hitp = p1 + u * (p2 - p1); // Now use hitp. } It works perfectly! But it seems slow... I'm new at GLSL. You can answer this questions in two ways: Tell me there is no solution, showing some proof or strong evidence. Tell me about GLSL features (vector APIs, primitive operations) that makes the above algorithm faster, showing some example. Thanks a lot!

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