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Meaning of $? (dollar question mark) in shell scripts

.../drush status bootstrap | grep -q $(vendor/bin/drush php-eval 'if (function_exists("t")) echo t("Successful");') &> /dev/null;. If I had to put that in a single line if [ ... ] it would be terribly unreadable. I plan to store the output of that line to a variable so I can just say if [ $drupa...
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Setting WPF image source in code

...packUri = "pack://application:,,,/AssemblyName;component/Images/icon.png"; _image.Source = new ImageSourceConverter().ConvertFromString(packUri) as ImageSource; share | improve this answer ...
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Exporting a function in shell

...n parent shell (bash, sh or ksh) so that the function will be available to all the child process launced from the parent process? ...
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How to remove all event handlers from an event

... I found a solution on the MSDN forums. The sample code below will remove all Click events from button1. public partial class Form1 : Form { public Form1() { InitializeComponent(); button1.Click += button1_Click; button1.Click += button1_Click2; button2.Clic...
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difference between collection route and member route in ruby on rails?

...h search_photos_path Acts on collection of resources(display all photos) share | improve this answer | follow | ...
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How to prevent vim from creating (and leaving) temporary files?

... I added this to my _vimrc file on Windows, and I'm still getting file~ files. Am I not doing something correctly? – FilBot3 Aug 26 '15 at 14:48 ...
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Best approach to converting Boolean object to string in java

...irst test for null and later invoke toString() method on your object. Calling Boolean.toString(b) will invoke public static String toString(boolean b) { return b ? "true" : "false"; } which is little slower than b.toString() since JVM needs to first unbox Boolean to boolean which will be...
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Start may not be called on a promise-style task. exception is coming

...s already started the task before giving it to you. You should only ever call Start on a task that you create by calling its constructor, and you shouldn't even do that unless you have a compelling reason to not start the task when you create it; if you want it started right away you should use Tas...
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C# Entity-Framework: How can I combine a .Find and .Include on a Model Object?

... I would really recommend using the latter (SingleOrDefault), ToList will retrieve all entries first and then select one – Sander Rijken Sep 8 '11 at 13:51 ...
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Xcode 'Build and Archive' menu item disabled

... All you need to do is create an Executable File in your project folder... If you start with a fresh project there are NO executable projects, only what you create, be it a .cpp or a .m you need an executable in the folder. ...