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How can I check if a command exists in a shell script? [duplicate]
... script I would like to check if a certain command exists, and if not, install the executable. How would I check if this command exists?
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Detecting input change in jQuery?
...ill fire when the user is typing into a text field, pasting, undoing, basically anytime the value changed from one value to another.
In jQuery do that like this
$('#someInput').bind('input', function() {
$(this).val() // get the current value of the input field.
});
starting with jQuery 1.7...
What is the rationale behind having companion objects in Scala?
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The companion object basically provides a place where one can put "static-like" methods. Furthermore, a companion object, or companion module, has full access to the class members, including private ones.
Companion objects are great for encapsulating...
Is there a label/goto in Python?
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Just a notice: loopfunc will generally require inputs and some more effort to implement, but it is the best way in most cases I think.
– kon psych
May 20 '16 at 18:43
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Inner join vs Where
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I really do wish to see if there are any official documentation from Oracle saying about this
– 4 Leave Cover
Sep 6 '16 at 11:31
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What is SuppressWarnings (“unchecked”) in Java?
...to, and you need to effectively tell the compiler that what you're doing really will be legal at execution time.
I usually find this a pain when I'm mocking a generic interface, but there are other examples too. It's usually worth trying to work out a way of avoiding the warning rather than suppres...
How do I link a JavaScript file to a HTML file?
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Thank you SO MUCH. This is exactly the answer that I finally figured out! I know that the question was elementary but I thank you for taking the time to show me this! What I was missing was placing the jQuery library before the javascript file!
– firstofth3...
How can I select random files from a directory in bash?
...are 100% safe regarding files with spaces and funny symbols in their name. All of them will populate an array randf with a list of random files. This array is easily printed with printf '%s\n' "${randf[@]}" if needed.
This one will possibly output the same file several times, and N needs to be kno...
How to find out line-endings in a text file?
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@JessChadwick: Yes, but only if you explicitly install the tofrodos package with sudo apt-get install tofrodos - just as you'd have to run sudo apt-get install dos2unix to get dos2unix and unix2dos.
– mklement0
Dec 20 '15 at 1:54
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Auto start node.js server on boot
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This isn't something to configure in node.js at all, this is purely OS responsibility (Windows in your case). The most reliable way to achieve this is through a Windows Service.
There's this super easy module that installs a node script as a windows service, it's called n...