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How to debug a bash script? [closed]

...s, for x.) Also, shells generally provide options '-n' for 'no execution' and '-v' for 'verbose' mode; you can use these in combination to see whether the shell thinks it could execute your script — occasionally useful if you have an unbalanced quote somewhere. There is contention that the '-x...
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How to set the prototype of a JavaScript object that has already been instantiated?

...e I have an object foo in my JavaScript code. foo is a complex object and it is generated somewhere else. How can I change the prototype of the foo object? ...
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Why do we need private subnet in VPC?

...ed, or the Managed NAT Gateway service can be provisioned, instead. An expanded version of this answer integrating more information about NAT Gateway and how it compares to a NAT instance will be forthcoming, as these are both relevant to the private/public subnet paradigm in VPC. Note that the In...
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MySQL maximum memory usage

... MySQL's maximum memory usage very much depends on hardware, your settings and the database itself. Hardware The hardware is the obvious part. The more RAM the merrier, faster disks ftw. Don't believe those monthly or weekly news letters though. MySQL doesn't scale linear - not even on Oracle hard...
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What is the purpose of “&&” in a shell command?

As far as I know, using & after the command is for running it in the background. 9 Answers ...
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When should one use final for method parameters and local variables?

... references ( for example ) that suggest using final as much as possible and I'm wondering how important that is. This is mainly in the the context of method parameters and local variables, not final methods or classes. For constants, it makes obvious sense. ...
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What is the difference between '@' and '=' in directive scope in AngularJS?

I've read the AngularJS documentation on the topic carefully, and then fiddled around with a directive. Here's the fiddle . ...
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What does do?

... October 2015 Update This answer was posted several years ago and now the question really should be should you even consider using the X-UA-Compatible tag on your site? with the changes Microsoft has made to its browsers (more on those below). Depending upon what Microsoft browsers you...
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What is a monad?

...t necessarily “good”. They are a pattern which is sometimes beneficial and sometimes not. Do note that the monadic patten can be combined in a different way: [1,2,3].flatMap(a => [a + 1].flatMap(b => b != 3 ? [b] : [])) Here the binding is nested rater than chained, but the result is the ...
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Dependency Inject (DI) “friendly” library

...ably be classes intended for consumers to use directly on a regular basis, and "support classes" that are dependencies of those more common "end user" classes. ...