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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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Using HTML5/Canvas/JavaScript to take in-browser screenshots

...mplementation of it into sending feedbacks like you described. The script allows you to create feedback forms which include a screenshot, created on the client's browser, along with the form. The screenshot is based on the DOM and as such may not be 100% accurate to the real representation as it do...
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How does cookie based authentication work?

...which client and then give access the request. Once a user logs out of the app, the session is destroyed both client-side and server-side. share | improve this answer | foll...
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How to know what the 'errno' means?

When calling execl(...) , I get an errno=2 . What does it mean? How can I know the meaning of this errno ? 15 Answers ...
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Pass correct “this” context to setTimeout callback?

...erscore.js, lodash It's available in Underscore.js, as well as lodash, as _.bind(...)1,2 bind Bind a function to an object, meaning that whenever the function is called, the value of this will be the object. Optionally, bind arguments to the function to pre-fill them, also known as partial appl...
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What is the difference between 'typedef' and 'using' in C++11?

... All standard references below refers to N4659: March 2017 post-Kona working draft/C++17 DIS. Typedef declarations can, whereas alias declarations cannot, be used as initialization statements But, with the first two non-temp...
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90后创业四年:曾经觉得不公 后来愿赌服输 - 资讯 - 清泛网 - 专注C/C++及内核技术

...术,用人工智能的方法让机器创作出曲子来。用户在听画App上传一张照片,我们能用人工智能技术为每张照片配上属于它的原创音乐。除了社交,我们更想把听画打造成草根音乐人的原创音乐创作社区。因为,我们的人工智能谱...
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Using isKindOfClass with Swift

... Another approach using the new Swift 2 syntax is to use guard and nest it all in one conditional. guard let touch = object.AnyObject() as? UITouch, let picker = touch.view as? UIPickerView else { return //Do Nothing } //Do something with picker ...
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Instance v state variables in react.js

...nter: function () { // Open a new one after a delay this._timeout = setTimeout(function () { this.openWidget(); }.bind(this), DELAY); }, handleLeave: function () { // Clear the timeout for opening the widget clearTimeout(this._timeout...
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Map enum in JPA with fixed values?

I'm looking for the different ways to map an enum using JPA. I especially want to set the integer value of each enum entry and to save only the integer value. ...