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What is the $? (dollar question mark) variable in shell scripting? [duplicate]
...t is the $? variable hold? I can't Google search the answer because they block punctuation characters.
9 Answers
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Check if object exists in JavaScript
...ariable exists (unless you want to wrap every second line into a try-catch block).
The reason is Javascript has this notorious value of undefined which strikingly doesn't mean that the variable is not defined, or that it doesn't exist undefined !== not defined
var a;
alert(typeof a); // undefined ...
How can I setup & run PhantomJS on Ubuntu?
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If bitbucket.org is blocked by your proxy npm install phantomjs --phantomjs_cdnurl=http://cnpmjs.org/downloads
– 79E09796
Nov 26 '15 at 17:38
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Running code in main thread from another thread
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A condensed code block is as follows:
new Handler(Looper.getMainLooper()).post(new Runnable() {
@Override
public void run() {
// things to do on the main thread
}
});
This does not involve passing down...
Automatically enter SSH password with script
...
just be aware that while sshpass blocks your password from commands like ps -aux, you shouldn't normally run commands by typing your password because other users on the same computer may be able to see the password by running ps -aux. if practical, you also...
Bootstrap Dropdown menu is not working
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Your words are correct but the code blocks are the opposite of what you say.
– Astra Bear
Sep 14 '16 at 22:00
add a comment
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How To Auto-Format / Indent XML/HTML in Notepad++
Is there a way to re-indent a block of code? I'm looking for something similar to Ctrl + Shift + F in Eclipse (Auto-Format/Indent).
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How to debug a Flask app
... where you want to start debugging.
Be sure not to use too-broad except blocks. Surrounding all your code with a catch-all try... except... will silence the error you want to debug. It's unnecessary in general, since Flask will already handle exceptions by showing the debugger or a 500 error and ...
How to escape double quotes in JSON
... is because you're building your text string within an HTML <script> block, and the first double backslash inserts a single backslash into the string variable then the following backslash double quote inserts the double quote into the string so that the resulting script string contains the \" ...
MLKitFaceMesh 拓展：面部网格（468 个关键点） · App Inventor 2 中文网
...g:hover { color: #3773f5 } .feedback-pop .feedback-img { display: inline-block; width: 24px; height: 24px; margin-bottom: 4px; background: url(/static/images/feedback.svg) 50% / 100% auto no-repeat; } /*手机版：反馈浮动按钮收小*/ @media screen and (max-width: 700px) { .feedback-po...