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How do I script a “yes” response for installing programs?

I work with Amazon Linux instances and I have a couple scripts to populate data and install all the programs I work with, but a couple of the programs ask: ...
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What does $$ mean in the shell?

... (e.g., /tmp). It's easy to litter /tmp with symlinks that will cause your script to write somewhere undesirable. mktemp is much better. – Chris Jester-Young Sep 17 '08 at 0:11 5 ...
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Check if my app has a new version on AppStore

...isUpdateAvailable() DispatchQueue.main.async { // show alert } } catch { print(error) } } Update Using URLSession: Instead of using Data(contentsOf: url) and block a thread, we can use URLSession: func isUpdateAvailable(completion: @escaping (Bool?, E...
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What is Common Gateway Interface (CGI)?

...likely used another, specific for PHP, means of communication between your scripts and the webserver, this, as you well mention in your question, is an embedded interpreter called mod_php. So, answering your questions: What exactly is CGI? See above. Whats the big deal with /cgi-bin/*.cgi...
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I need to securely store a username and password in Python, what are my options?

I'm writing a small Python script which will periodically pull information from a 3rd party service using a username and password combo. I don't need to create something that is 100% bulletproof (does 100% even exist?), but I would like to involve a good measure of security so at the very least it w...
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Preview an image before it is uploaded

...ng } } $("#imgInp").change(function() { readURL(this); }); <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <form runat="server"> <input type='file' id="imgInp" /> <img id="blah" src="#" alt="your image" /> &lt...
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How to use multiple arguments for awk with a shebang (i.e. #!)?

I'd like to execute an gawk script with --re-interval using a shebang. The "naive" approach of 10 Answers ...
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CSS scrollbar style cross browser [duplicate]

...s. FaceScroll Custom scrollbar hope it help's Edit Step 1: Add the below script to the section of your page: <link href="general.css" rel="stylesheet" type="text/css"> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script&gt...
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Twitter Bootstrap Customization Best Practices [closed]

...es for all Less files i am customizing: Such as: "variables-custom.less", "alerts-custom.less", "buttons-custom.less". So i can use some standards and have my own additions. The downside is: When Bootstrap will be update it's really hard to migrate. But there is something else: Override Styles W...
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Changing the selected option of an HTML Select element

...elements. I want to use jQuery to check each option's value against a Javascript var . If one matches, I want to set the selected attribute of that option. How would I do that? ...