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  • How do I implement the bg, &, and fg commands functionaliity in my custom unix shell program written in C

    - by user1631009
    I am extending the functionality of a custom unix shell which I wrote as part of my lab assignment. It currently supports all commands through execvp calls, in-built commands like pwd, cd, history, echo and export, and also redirection and pipes. Now I wanted to add support for running a command in background e.g. $ls -la& I also want to implement bg and fg job control commands. I know this can be achieved if I execute the command by forking a new child process and not waiting for it in the parent process. But how do I again bring this command to foreground using fg? I have the idea of entering each background command in a list assigning each of them a serial number. But I don't know how do I make the processes execute in the background, then bring them back to foreground. I guess wait() and waitpid() system calls would come handy but I am not that comfortable with them. I tried reading the man pages but still am in the dark. Can someone please explain in a layman's language how to achieve this in UNIX system programming? And does it have something to do with SIGCONT and SIGSTP signals?

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  • How do I implement the bg, &, and bg commands functionaliity in my custom unix shell program written in C

    - by user1631009
    I am trying to extend the functionality of my custom unix shell which I earlier wrote as part of my lab assignment. It currently supports all commands through execvp calls, in-built commands like pwd, cd, history, echo and export, and also redirection and pipes. Now I wanted to add the support for running a command in background e.g. $ls -la& Now I also want to implement bg and fg job control commands. I know this can be achieved if I execute the command by forking a new child process and not waiting for it in the parent process. But how do I again bring this command to foreground using fg? I have the idea of entering each background command in a list assigning each of them a serial number. But I don't know how do I make the processes execute in the background, then bring them back to foreground. I guess wait() and waitpid() system calls would come handy but I am not that comfortable with them. I tried reading the man pages but still am in the dark. Can someone please explain in a layman's language how to achieve this in UNIX system programming? And does it have something to do with SIGCONT and SIGSTP signals?

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  • How to structure reading of commands given at a(n interactive) CLI prompt?

    - by Anto
    Let's say I have a program called theprogram (the marketing team was on strike when the product was to be named). I start that program by typing, perhaps not surprisingly, the program name as a command into a command prompt. After that, I get into a loop (from the users standpoint, an interactive command-line prompt), where one command will be read from the user, and depending on what command was given, the program will execute some instructions. I have been doing something like the following (in C-like pseudocode): main_loop{ in=read_input(); if(in=="command 1") do_something(); else if(in=="command 2") do_something_else(); ... } (In a real program, I would probably encapsulate more things into different procedures, this is just an example.) This works well for a small amount of commands, but let's say you have 100, 1000 or even 10 000 of them (the manual would be huge!). It is clearly a bad idea to have 10 000 ifs and else ifs after each other, for instance, the program would be hard to read, hard to maintain, contain a lot of boilerplate code... Yeah, you don't want to do that, so what approach would you recommend me to use (I will probably never use 10 000 commands in a program, but the solution should, at least preferably, be able to scale to that kind of massive (?) problems. The solution doesn't have to allow for arguments to the commands)?

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  • DefaultHttpClient GET and POST commands Java Android

    - by RenegadeAndy
    Ok this is my application : An Android app to allow me to submit CokeZone codes into CokeZone.co.uk from a mobile app instead of from the website. So I wrote this section of code to do the post logon command and then check to see if im logged in after. Problem is - the html I get from the homepage after I send the post command is the default - as if im not logged in - so something is going wrong. Can anyone please help! Its probably the URL im sending the POST to, or the params within the POST command - I havent done much of this stuff so its probably something obvious. Below is my code so far: DefaultHttpClient httpclient = new DefaultHttpClient(); HttpGet httpget = new HttpGet(url); HttpResponse response = httpclient.execute(httpget); HttpEntity entity = response.getEntity(); thisResponse = printPage(entity.getContent()); Log.e("debug",thisResponse); System.out.println("Login form get: " + response.getStatusLine()); if (entity != null) { entity.consumeContent(); } System.out.println("Initial set of cookies:"); List<Cookie> cookies = httpclient.getCookieStore().getCookies(); if (cookies.isEmpty()) { System.out.println("None"); } else { for (int i = 0; i < cookies.size(); i++) { System.out.println("- " + cookies.get(i).toString()); } } HttpPost httpost = new HttpPost("https://secure.cokezone.co.uk/home/blank.jsp?_DARGS=/home/login/login.jsp"); List <NameValuePair> nvps = new ArrayList <NameValuePair>(); nvps.add(new BasicNameValuePair("_dyncharset", "ISO-8859-1")); nvps.add(new BasicNameValuePair("/grlp/login/LoginHandler.loginFormBean.name","renegadeandy%40gmail.com")); nvps.add(new BasicNameValuePair("_D:/grlp/login/LoginHandler.loginFormBean.name", "+")); nvps.add(new BasicNameValuePair("/grlp/login/LoginHandler.cookiedUser", "false")); nvps.add(new BasicNameValuePair("_D:/grlp/login/LoginHandler.cookiedUser", "+")); nvps.add(new BasicNameValuePair("/grlp/login/LoginHandler.loginFormBean.password", "passwordval")); nvps.add(new BasicNameValuePair("_D:/grlp/login/LoginHandler.loginFormBean.password", "+")); nvps.add(new BasicNameValuePair("/grlp/login/LoginHandler.rememberMe", "yes")); nvps.add(new BasicNameValuePair("_D:/grlp/login/LoginHandler.rememberMe", "false")); nvps.add(new BasicNameValuePair("/grlp/login/LoginHandler.aSuccessURL", "http://www.cokezone.co.uk/home/index.jsp")); nvps.add(new BasicNameValuePair("_D:/grlp/login/LoginHandler.aSuccessURL", "+")); nvps.add(new BasicNameValuePair("/grlp/login/LoginHandler.aErrorURL", "http://www.cokezone.co.uk/home/index.jsphttps://secure.cokezone.co.uk/home/index.jsp")); nvps.add(new BasicNameValuePair("/grlp/login/LoginHandler.aErrorURL", "+")); nvps.add(new BasicNameValuePair("/grlp/login/LoginHandler.explicitLogin", "true")); nvps.add(new BasicNameValuePair("_D:/grlp/login/LoginHandler.explicitLogin", "+")); nvps.add(new BasicNameValuePair("/grlp/login/LoginHandler.fICLogin", "login")); nvps.add(new BasicNameValuePair("_D:/grlp/login/LoginHandler.fICLogin", "+")); nvps.add(new BasicNameValuePair("/grlp/login/LoginHandler.fICLogin", "LOGIN")); nvps.add(new BasicNameValuePair("_D:/grlp/login/LoginHandler.fICLogin", "+")); nvps.add(new BasicNameValuePair("_DARGS", "/home/login/login.jsp")); httpost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8)); response = httpclient.execute(httpost); entity = response.getEntity(); System.out.println("Login form get: " + response.getStatusLine()); if (entity != null) { thisResponse = printPage(entity.getContent()); entity.consumeContent(); } Log.e("debug",thisResponse); Log.e("debug","done"); httpget = new HttpGet("http://www.cokezone.co.uk/home/index.jsp"); response = httpclient.execute(httpget); entity = response.getEntity(); TextView points = (TextView)findViewById(R.id.points); points.setText(getPoints(entity.getContent()).toString()); debug.setText(thisResponse); System.out.println("Post logon cookies:"); cookies = httpclient.getCookieStore().getCookies(); if (cookies.isEmpty()) { System.out.println("None"); } else { for (int i = 0; i < cookies.size(); i++) { System.out.println("- " + cookies.get(i).toString()); } }

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  • WPF Commands firing via Keyboard shortcuts don't set the Command Parameter

    - by Aran Mulholland
    I have a command binding on the main form of my application. It is used to open details of the item that i am viewing. It has an associated keyboard shortcut. When i use the command in sub-forms i pass the object i want to open details for as a CommandParameter. This works if i attach the command to a button or a context menu, as i can specify the command parameter with a binding. However when the command is invoked as a result of a Keyboard shortcut i never get the chance to specify the parameter. How can i specify the command parameter at the sub-form level for a keyboard fired command. I need the CommandBinding with the CanExecute and Execute specified on the main form to globally handle all the open details events.

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  • commands&creating pointer [closed]

    - by gcc
    input 23 3 4 4 42 n 23 0 9 9 n n n 3 9 9 x //according to input,i should create int pointer arrays. pointer arrays // starting from 1 (that is initial arrays is arrays[1].when program sees n ,it // must be jumb to arrays 2 // the first int input 23 is num_arrays which used in malloc(sizeof(int)*num_arrays expected output: elements of arrays[1] 3 4 5 42 elements of arrays[2] 23 0 9 9 elements of arrays[5] 3 9 9 another input 12 2 3 4 n n 2 3 4 n 12 3 x expected output elements of arrays[1] 2 3 4 elements of arrays[3] 2 3 4 elements of arrays[4] 12 3 specification: x is stopper n is comman to create new pointer array i am new in this site anyone help me how can i write

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  • Running cmd commands via .NET?

    - by a2h
    System.Diagnostics.Process proc0 = new System.Diagnostics.Process(); proc0.StartInfo.FileName = "cmd"; proc0.StartInfo.WorkingDirectory = Path.Combine(curpath, "snd"); proc0.StartInfo.Arguments = omgwut; And now for some background... string curpath = System.IO.Path.GetDirectoryName(Application.ExecutablePath); omgwut is something like this: copy /b t.wav + y.wav + p.wav + e.wav + space.wav + i.wav + n.wav + space.wav + s.wav + o.wav + m.wav + e.wav + space.wav + t.wav + e.wav + x.wav + t.wav + space.wav + h.wav + e.wav + r.wav + e.wav + space.wav + a.wav + n.wav + d.wav + space.wav + p.wav + y.wav + r.wav + o.wav + space.wav + w.wav + i.wav + l.wav + l.wav + space.wav + s.wav + h.wav + o.wav + w.wav + space.wav + h.wav + i.wav + s.wav + space.wav + r.wav + e.wav + n.wav + d.wav + i.wav + t.wav + o.wav + n.wav + space.wav output.wav And nothing happens at all. So obviously something's wrong. I also tried "copy" as the executable, but that doesn't work.

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  • n & x commands&creating pointer&with using malloc [closed]

    - by gcc
    input 23 3 4 4 42 n 23 0 9 9 n n n 3 9 9 x //according to input,i should create int pointer arrays. pointer arrays // starting from 1 (that is initial arrays is arrays[1].when program sees n ,it // must be jumb to arrays 2 // the first int input 23 is num_arrays which used in malloc(sizeof(int)*num_arrays expected output arrays[1] 3 4 5 42 arrays[2] 23 0 9 9 arrays[5] 3 9 9 another input 12 2 3 4 n n 2 3 4 n 12 3 x expected output arrays[1] 2 3 4 arrays[3] 2 3 4 arrays[4] 12 3 x is stopper n is comman to create new pointer array i am new in this site anyone help me how can i write

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  • How to handle One View with multiple ViewModel and fire different Commands

    - by Naresh
    Hi All, I have senario in which one view and view has binding with multiple ViewModel. Eg. One View displaying Phone Detail and ViewModel as per bellow: Phone basic features- PhoneViewModel, Phone Price Detail- PhoneSubscriptionViewModel, Phone Accessories- PhoneAccessoryViewModel For general properties- PhoneDetailViewModel I have placed View's general properties to PhoneViewModel.Now senario is like this: By default View displays Phone Basic feaures which is bind with ObservationCollection of PhoneViewModel. My view have button - 'View Accessories', onclick of this button one popup screen- in my design I have display/hide Grid and bind it with ObservationCollection of PhoneAccessoryViewModel. Now problem begins- Accessory List also have button 'View Detail' onclick I have to open one popup screen, here also I had placed one Grid and Visible/Hide it. I have bind 'ViewAccessoryDetailCommand' command to 'View Detail' button. And on command execution one function fires and set property which Visible the Popup screen. Using such programming command fires, function calls but the property change not raises and so my view does not display popup. Summary: One View-- ViewModel1--Grid Bind view ViewModel2 --Grid Have Button and Onclick display new Grid which binded with ViewModel3-this Command fires but property not raises. I think there is some problem in my methodology, Please, give your suggetions.

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  • Implementing custom CanExecuteChanged event with Commands in WPF

    - by ajtp
    Hi everybody, I try to do a custom CanExecuteChanged event for a command button. Inside CanExecuteChanged event I would like to do some stuff when canExecute value change but I don't want to do it by implementing a custom command button class (deriving from Button and Implementing ICommandSource). Also I don't want to do my stuff into CanExecute method. Any ideas? Thanks.

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  • how to run commands (external) in gvim

    - by groovynoob
    I am getting ready to write lot of small experimental java programs as I am studying for java certification. Since I want to avoid using an IDE I'm giving gvim a try. I have a HelloWorld.java file open. How can I run javac and then java and then be able to see the output all in one window? I do not want to alt tab to a dos prompt window. compile/run the program there and then come back to my editor.

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  • Final form of parametric SQL commands in ADO.NET

    - by mcoolbeth
    I am getting a syntax error when I send a parameterized query to Access from my C# program via ADO.NET. I, of course, know what SQL string I have included in my code, with the parameter names embedded inside. Does anyone know how I can look at the SQL string that is finally sent to the DBMS during after I call cmd.ExecuteNonQuery? Thanks.

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  • WPF Using commands to slow to update UI controls

    - by toni
    Hi, I bind a command to a button through command property and doing a command binding in the page it is placed. In execute method I create an instance of a class that contains the background worker and I start it (this is a long task). The background worker (bw) class contains a variable isRunning that it is set to true before DoWork method is executed and to false when RunWorkerCompleted is executed. So from the code behind of the page where button is placed, in CanExecute method I set e.canExecute to true if bw is no running (isRunning = false), and e.canExecute to false if isRunning = true. WHen I press the button, it launch bw process for a long time and the button gets disabled. Ok this is correct, but when background worker (bw) finishes, the button doesn't returns to enabled until I press it again. When it is disabled and I press (when bw is finished) it gets enabled. Why the button is not returning automatically to enabled at the end of the bw? my code snippet: <Page x:Class="GParts.Pages.MyPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:Microsoft_Windows_Themes="clr-namespace:Microsoft.Windows.Themes; assembly=PresentationFramework.Aero" xmlns:local="clr-namespace:GParts" Loaded="Page_Loaded" Unloaded="Page_Unloaded" Height="Auto"> <Page.CommandBindings> <CommandBinding Command="{x:Static local:Pages.MyPage.rcmd}" Executed="CommandBinding_Executed" CanExecute="CommandBinding_CanExecute"/> </Page.CommandBindings> <...> <Button Command="{x:Static local:Pages.MyPage.rcmd}" /> <...> </Page> The code behind of the page: namespace GParts.Pages { public partial class MyPage : Page { public static RoutedCommand rcmd = new RoutedCommand(); private cBgWorker bw; <...> // ExecutedRoutedEventHandler for the custom button remove all command. private void CommandBinding_Executed(object sender, ExecutedRoutedEventArgs e) { // get an isntance of the background worker class bw = new cBgWorker(); // start the long task bw.StartTask(); } // CanExecuteRoutedEventHandler for the custom button remove all command. private void CommandBinding_CanExecute(object sender, CanExecuteRoutedEventArgs e) { // bw is the instance of background worker class if (bw == null) { e.CanExecute = true; } else { e.CanExecute = !bw.isRunning;// isRunning indicates if bw is //executing now } } <...> } // end class } // end namespace

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  • Implementing commands in MMVM

    - by user312372
    I am trying to change the source property of the frame in Page1.xaml when the SampleCommand is excecuted. How do I acheive this in the View Model? Page1.xaml: <Page ...> <DockPanel> <r:ribbon> <r:RibbonTab Label="Keys"> <r:RibbonTab.Groups> <r:RibbonGroup GroupSizeDefinitions="{StaticResource RibbonLayout}"> <r:RibbonGroup.Command> <r:RibbonCommand LabelTitle="RibbonButton"/> </r:RibbonGroup.Command> <r:RibbonButton x:Name="RibbonButton1" Command="{Binding Path=SampleCommand}"/> </r:RibbonGroup> </r:RibbonTab.Groups> </r:RibbonTab> </r:Ribbon> <Border Name="PageBorder" Grid.Row="0" Grid.Column="1"> <Frame Name="pageFrame" Source="FirstPage.xaml" /> </Border> </DockPanel> </Page> Page1ViewModel.cs: RelayCommand _sampleCommand; public ICommand SampleCommand { get { // create command ?? return _sampleCommand } } page1.xaml.cs: Page1ViewModel pageViewModel; //When page loads this.DataContext = pageViewModel;

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  • For commands to check duped/multiple mc's.

    - by Desmond
    Currently I'm working on a platform type game. I have a for loop in place to check weather or not the players feet are touching the ground. I had this; for (i=0; i<5; i++) { //There are 5 floors if (this.feet.hitTest(_root["g"+i])) { _root.mc.groundTouch = true; //triggers the mc falling } } This works fine only if one of the floors exist(IE if floor1 is on the stage, but floor2-5 aren't); So to try and counter it I tried using; for (i=0; i<5; i++) { if (this.feet.hitTest(_root["floor"+i])) { _root.mc.groundTouch = true; //triggers the mc falling } if (!this.feet.hitTest(_root["floor"+i])) { _root.mc.groundTouch = false; } } This obviously doesn't work because in order for it to function properly, _root.mc.feet would have to be touching all 5 instances of "floor". So my question is; How do I get the code to make _root.mc.groundTouch = true if _root.mc.feet is touching any of the floor instances, but make _root.mc.groundTouch = false only if its touching none of the floor instances? I know that if I really wanted to I could do something like if (_root.mc.feet.hitTest(_root.floor1) && !_root.mc.feet.hitTest(_root.floor2) && etc) But to save myself time, and to give myself the ability to add floors without altering more then i<5 to the amount of floors I have, I would prefer a easier method hopefully something to do with for loops. Thank you ahead of time and your help is very much appreciated

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  • How to suppress quotes in Powershell commands to executables

    - by David Gladfelter
    Is there any way to supress the enclosing quotation marks around each command-line argument that powershell likes to generate and then pass to external executables for command line arguments that have spaces in them? Here's the situation: One way to unpack many installers is a command of the form: msiexec /a <packagename> /qn TARGETDIR="<path to folder with spaces>" Trying to execute this from powershell has proven quite difficult. Powershell likes to enclose parameters with spaces in double-quotes. The following lines: msiexec /a somepackage.msi /qn 'TARGETDIR="c:\some path"' msiexec /a somepackage.msi /qn $('TARGETDIR="c:\some path"') $td = '"c:\some path"' msiexec /a somepackage.msi /qn TARGETDIR=$td All result in the following command line (as reported by the Win32 GetCommandLine() api): "msiexec" /a somepackage.msi /qn "TARGETDIR="c:\some path"" This command line: msiexec /a somepackage.msi TARGETDIR="c:\some path" /qn results in "msiexec" /a fooinstaller.msi "TARGETDIR=c:\some path" /qn It seems that Powershell likes to enclose the results of expressions meant to represent one argument in quotation marks when passing them to external executables. This works fine for most executables. However, MsiExec is very specific about the quoting rules it wants and won't accept any of the command lines Powershell generates for paths have have spaces in them. Is there any way to suppress this behavior?

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  • How can I use aliased commands with xargs?

    - by Nathan Fellman
    I have the following alias in my .aliases: alias gi grep -i and I want to look for foo case-insensitively in all the files that have the string bar in their name: find -name \*bar\* | xargs gi foo This is what I get: xargs: gi: No such file or directory Is there any way to use aliases in xargs, or do I have to use the full version: find -name \*bar\* | xargs grep -i foo Note: This is a simple example. Besides gi I have some pretty complicated aliases that I can't expand manually so easily. Edit: I used tcsh, so please specify if an answer is shell-specific.

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  • Automating Disk Cleanup on Windows using commands

    - by Ram
    Hi, I asked this question on MSDN forum but there was no response.. Maybe I had posted in the wrong forum... So I'm posting it again here, hoping that someone might be able to help me out here... I am trying to run Disk Cleanup in the command prompt (and through a C# program) and so I went through all the available options from this link : http://support.microsoft.com/kb/315246 While I am just trying to understand what I can do, it would be good if someone could explain why the drive option /d cannot be set while specifying /sagerun:n Or is it possible, by some way, to run /sagerun for a specific drive? Pls suggest... Thanks, Ram

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  • implementing ioctl() commands in FreeBSD

    - by thecoffman
    I am adding some code to an existing FreeBSD device driver and I am trying to pass a char* from user space to the driver. I've implemented a custom ioctl() command using the _IOW macro like so: #define TIBLOOMFILTER _IOW(0,253,char*) My call looks something like this: int file_desc = open("/dev/ti0", O_RDWR); ioctl(file_desc, TIBLOOMFILTER, (*filter).getBitArray()); close(file_desc); When I call ioctl() I get: Inappropriate ioctl for device as an error message. Any guess as to what may be doing wrong? I've defined the same macro in my device driver, and added it to the case statement.

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