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How to mkdir only if a directory does not already exist?
I am writing a shell script to run under the KornShell (ksh) on AIX. I would like to use the mkdir command to create a directory. But the directory may already exist, in which case I do not want to do anything. So I want to either test to see that the directory does not exist, or suppress the "Fil...
Representing and solving a maze given an image
... colors so that final grayscale image is approximately uniform. You can do it simply by controlling sliders in Photoshop in Image -> Adjustments -> Black & White.
Convert image to binary by setting appropriate threshold in Photoshop in Image -> Adjustments -> Threshold.
Make sure thr...
Listing all extras of an Intent
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edited Oct 30 '19 at 12:57
Sean McManus
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Redis is single-threaded, then how does it do concurrent I/O?
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Well it depends on how you define concurrency.
In server-side software, concurrency and parallelism are often considered as different concepts. In a server, supporting concurrent I/Os means the server is able to serve several cli...
How do you perform a left outer join using linq extension methods
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For a (left outer) join of a table Bar with a table Foo on Foo.Foo_Id = Bar.Foo_Id in lambda notation:
var qry = Foo.GroupJoin(
Bar,
foo => foo.Foo_Id,
bar => bar.Foo_Id,
(x,y) => new { Foo = x, Bars = y })
...
What is a StoryBoard ID and how can i use this?
...ed in Xcode 4.5. I saw for every viewController that i could set some identity variables including the storyboard ID. What is this and how can i use it?
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How to inherit from a class in javascript?
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I should note that Object.create is usually much slower than using new with a function constructor.
//The prototype is just an object when you use `Object.create()`
var Base = {};
//This is how you create an instance:
var baseInstance = Object.create(Base);
//If you want to inherit from "Base"...
How to fix “ImportError: No module named …” error in Python?
...r the directory that the script is in. Add /home/bodacydo/work/project to either sys.path or $PYTHONPATH.
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The import org.junit cannot be resolved
...lve a java problem for an interview, and they have sent me the test class. It starts with
13 Answers
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PHP: How to remove specific element from an array?
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Use array_search to get the key and remove it with unset if found:
if (($key = array_search('strawberry', $array)) !== false) {
unset($array[$key]);
}
array_search returns false (null until PHP 4.2.0) if no item has been found.
And if there can be multiple ite...