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How do I kill background processes / jobs when my shell script exits?
... kill $(jobs -p) doesn't work in dash, because it executes command substitution in a subshell (see Command Substitution in man dash)
– user1431317
Jun 15 '17 at 13:37
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Handling optional parameters in javascript
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You can know how many arguments were passed to your function and you can check if your second argument is a function or not:
function getData (id, parameters, callback) {
if (arguments.length == 2) { // if only two arguments were supplied
if (Object.prototype.toString.call(param...
How does one capture a Mac's command key via JavaScript?
...is not going to be captured by browsers as such.
This is only for the command key on MacOS/keyboards.
Unlike Shift/Alt/Ctrl, the Cmd (“Apple”) key is not considered a modifier key—instead, you should listen on keydown/keyup and record when a key is pressed and then depressed based on event...
How to properly exit a C# application?
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Application.Exit
Informs all message pumps that they must terminate, and then closes all application windows after the messages have been processed. This is the code to use if you are have called Application.Run (WinForms applications), this method stops all running message loops on all thread...
Skip download if files exist in wget?
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-nc doesn't prevent the sending of the HTTP request and subsequent downloading of the file. It just doesn't do anything after downloading the file if the file has already been fully retrieved. Is there anyway to prevent making the HTTP request if the file already exists? stack...
How to select the nth row in a SQL database table?
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There are ways of doing this in optional parts of the standard, but a lot of databases support their own way of doing it.
A really good site that talks about this and other things is http://troels.arvin.dk/db/rdbms/#select-limit.
Basically, PostgreSQL and MySQL supports the non-...
Android: Generate random color on click?
I have an ImageView , in which I am programmaticly creating drawables and presenting them to the user. My goal is to click on said ImageView and change the drawable's color.
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How do I get a YouTube video thumbnail from the YouTube API?
If I have a YouTube video URL, is there any way to use PHP and cURL to get the associated thumbnail from the YouTube API?
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What's the difference between EscapeUriString and EscapeDataString?
...apeDataString for a URI parameter. I tested with the string "I heart C++" and EscapeUriString did not encode the "+" characters, it just left them as is, EscapeDataString correctly converted them to "%2B".
– BrainSlugs83
Nov 10 '13 at 3:42
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At runtime, find all classes in a Java application that extend a base class
...ns. I mistakenly figured this would be as easy as it is in the .Net world and this answer has saved me a lot of time.
– akmad
Oct 1 '12 at 19:55
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