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What is the use case of noop [:] in bash?
...or if statements when I comment out all the code. For example you have a test:
if [ "$foo" != "1" ]
then
echo Success
fi
but you want to temporarily comment out everything contained within:
if [ "$foo" != "1" ]
then
#echo Success
fi
Which causes bash to give a syntax error:
line 4:...
Make sure only a single instance of a program is running
...code should do the job, it is cross-platform and runs on Python 2.4-3.2. I tested it on Windows, OS X and Linux.
from tendo import singleton
me = singleton.SingleInstance() # will sys.exit(-1) if other instance is running
The latest code version is available singleton.py. Please file bugs here.
...
Setting “checked” for a checkbox with jQuery
...('checked', false);
Note that this is the approach used by jQuery's unit tests prior to version 1.6 and is preferable to using $('.myCheckbox').removeAttr('checked'); since the latter will, if the box was initially checked, change the behaviour of a call to .reset() on any form that contains it ...
how to set a value for a span using JQuery
...
You can do:
$("#submittername").text("testing");
or
$("#submittername").html("testing <b>1 2 3</b>");
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How to sort by two fields in Java?
...es it a bit more clunky to define compared to LINQ.
Here is the full unit test for reference:
@Test
public void testChainedSorting()
{
// Create the collection of people:
ArrayList<Person> people = new ArrayList<>();
people.add(new Person("Dan", 4));
people.add(new Pers...
Error type 3 Error: Activity class {} does not exist
...
May be helpful for someone:--
Sometimes when testing on a device, the app doesn't uninstall properly. To verify and fix this:
Go to Settings.
Go to Apps.
Select your app. (here, you can verify that your app is not uninstalled properly).
Open the overflow menu on the t...
delete vs delete[] operators in C++
...tor delete[] is distinguished but delete operator can release array too.
test* a = new test[100];
delete a;
And already checked this code have no memeory leak.
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What is the difference between `let` and `var` in swift?
...erence comes when using it with class instances (reference types):
class CTest
{
var str : String = ""
}
let letTest = CTest()
letTest.str = "test" // OK
letTest.str = "another test" // Still OK
//letTest = CTest() // Error
var varTest1 = CTest()
var varTest2 = CTest()
var varTest3 = CTest(...
What are the real-world strengths and weaknesses of the many frameworks based on backbone.js? [close
Hope that someone can share their experience with some of the latest emerging backbone.js variants out there.
I have some good experience with backbone/underscore/require in several projects and I will like to take the next step towards more advanced solutions for complex application structure.
...
Dealing with “Xerces hell” in Java/Maven?
...Do they go with the same version of Xerces or use something else?
Actually test their parsing (e.g. through unit testing) and classloading as well as not to clutter up their classpath.
Not all developers keep track of newly introduced dependencies (e.g. with mvn dependency:tree). This approach wi...