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What is the best way to ensure only one instance of a Bash script is running? [duplicate]
...n used for ages and it can be used in bash scripts. I prefer simple flock (from util-linux[-ng]) over lockfile (from procmail). And always remember about a trap on exit (sigspec == EXIT or 0, trapping specific signals is superfluous) in those scripts.
In 2009 I released my lockable script boilerpla...
What are fail-safe & fail-fast Iterators in Java
... concurrent Collection implementations (including most Queues) also differ from the usual java.util conventions in that their Iterators and Spliterators provide weakly consistent rather than fast-fail traversal."
Typically, weak consistency means that if a collection is modified concurrently with ...
How do I debug Node.js applications?
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node-inspector could save the day! Use it from any browser supporting WebSocket. Breakpoints, profiler, livecoding, etc... It is really awesome.
Install it with:
npm install -g node-inspector
Then run:
node-debug app.js
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URLEncoder not able to translate space character
... implements the HTML Specifications for how to encode URLs in HTML forms.
From the javadocs:
This class contains static methods for
converting a String to the
application/x-www-form-urlencoded MIME
format.
and from the HTML Specification:
application/x-www-form-urlencoded
For...
How to convert a Java 8 Stream to an Array?
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If you want to get an array of ints, with values form 1 to 10, from a Stream, there is IntStream at your disposal.
Here we create a Stream with a Stream.of method and convert an Stream to an IntStream using a mapToInt. Then we can call IntStream's toArray method.
Stream<Integer> ...
Best way to detect when a user leaves a web page?
...s, only when the browser is closed, this will be ignored on all page loads from within the program.
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Is it possible to change the textcolor on an Android SearchView?
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Try something like this :
You would get a handle to the textview from the sdk and then change it since they don't expose it publicly.
int id = searchView.getContext().getResources().getIdentifier("android:id/search_src_text", null, null);
TextView textView = (TextView) searchView.findView...
Why is arr = [] faster than arr = new Array?
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Further expanding on previous answers...
From a general compilers perspective and disregarding VM-specific optimizations:
First, we go through the lexical analysis phase where we tokenize the code.
By way of example, the following tokens may be produced:
[]: ARRA...
Why is an int in OCaml only 31 bits?
...alled OOVM. So, it is not surprising at all that V8 uses well-known tricks from the Smalltalk world, since it was created by Smalltalkers based on Smalltalk technology.
– Jörg W Mittag
Jun 2 '19 at 1:21
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How to access a dictionary element in a Django template?
...rrible solution either. The goal of templates in Django is to insulate you from code in your templates and vice-versa.
I'd try the above method and see what SQL the ORM generates as I'm not sure off the top of my head if it will pre-cache the properties and just create a subselect for the property o...