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How to exit if a command failed?
I am a noob in shell-scripting. I want to print a message and exit my script if a command fails. I've tried:
8 Answers
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How to create dictionary and add key–value pairs dynamically?
...Basically, you're creating an object literal with 2 properties (called key and value) and inserting it (using push()) into the array.
Edit: So almost 5 years later, this answer is getting downvotes because it's not creating an "normal" JS object literal (aka map, aka hash, aka dictionary).
It is ...
Unable to find specific subclass of NSManagedObject
...r Xcode 7 (final):
Prepending the module name to the class (as in Xcode 6 and early beta releases of Xcode 7) is no longer necessary.
The Apple documentation Implementing Core Data Managed Object Subclasses has been
updated accordingly.
The Data Model inspector
has now two fields "Class" and "Mod...
How do I create a constant in Python?
...ng on other people's work, I have added an answer, far below, with a short and simple implementation of "Constants" for python 2.7 (which lacks "enum"). These are enum-like read-only name.attribute, and can contain any value. Declaration is easy Nums = Constants(ONE=1, PI=3.14159, DefaultWidth=100.0...
Chaining multiple filter() in Django, is this a bug?
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The way I understand it is that they are subtly different by design (and I am certainly open for correction): filter(A, B) will first filter according to A and then subfilter according to B, while filter(A).filter(B) will return a row that ma...
Invoking a jQuery function after .each() has completed
...he issue here: the calls to fade the elements are timer-driven animations, and those continue at their own pace.
The solution above, therefore, keeps track of how many elements are being faded. Each call to .fadeOut() gets a completion callback. When the callback notices that it's counted through a...
Does a favicon have to be 32x32 or 16x16?
I'd like to use a single image as both a regular favicon and iPhone/iPad friendly favicon.
9 Answers
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Should I make HTML Anchors with 'name' or 'id'?
...cation, 5.9.8 Navigating to a fragment identifier:
For HTML documents (and the text/html MIME type), the following processing model must be followed to determine what the indicated part of the document is.
Parse the URL, and let fragid be the <fragment> component of the URL.
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What should go into an .h file?
...ur code up into multiple files just what exactly should go into an .h file and what should go into a .cpp file?
12 Answers...
Can I split an already split hunk with git?
I've recently discovered git's patch option to the add command, and I must say it really is a fantastic feature.
I also discovered that a large hunk could be split into smaller hunks by hitting the s key, which adds to the precision of the commit.
But what if I want even more precision, if the...