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Bash tool to get nth line from a file
...en using head -n | tail -1 which does the trick, but I've been wondering if there's a Bash tool that specifically extracts a line (or a range of lines) from a file.
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What are the differences between Helper and Utility classes?
... it can be stateful or require an instance be created. I would avoid this if possible.
If you can make the name more specific. e.g. if it has sorting methods, make it XSorter
For arrays you can find helper classes like
Array
Arrays
ArrayUtil
ArrayUtils
ArrayHelper
BTW a short hand for a utilit...
Caveats of select/poll vs. epoll reactors in Twisted
...ockets, both mechanisms are so fast that you don't really care about this difference in the vast majority of cases.
One clarification, though. Both select and epoll scale linearly. A big difference, though, is that the userspace-facing APIs have complexities that are based on different things. T...
Increasing nesting function calls limit
There is one very bad limit in PHP: if you call some function a1() that calls a2(), that calls a3... so when a99() will call a100() you will see
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使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...ve as a template for a general rotation detector component that can be modified to fulfill specific requirements.
The implementation approach for multitouch here follows Using App Inventor extensions to implement multitouch: Scale Detector, which contains a more detailed explanation of the techni...
When to use CouchDB over MongoDB and vice versa
... scenarios for each NoSQL database compared. Quoting the link,
MongoDB: If you need dynamic queries. If you prefer to define indexes, not map/reduce functions. If you need good performance on a big DB. If you wanted CouchDB, but your data changes too much, filling up disks.
CouchDB : For accumula...
How can a Java program get its own process ID?
...and a Java virtual
machine implementation can choose to embed platform-specific useful
information in the returned name string. Each running virtual machine
could have a different name.
In Java 9 the new process API can be used:
long pid = ProcessHandle.current().pid();
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How to call one shell script from another shell script?
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There are a couple of different ways you can do this:
Make the other script executable, add the #!/bin/bash line at the top, and the path where the file is to the $PATH environment variable. Then you can call it as a normal command;
Or call it wi...
BeautifulSoup Grab Visible Webpage Text
Basically, I want to use BeautifulSoup to grab strictly the visible text on a webpage. For instance, this webpage is my test case. And I mainly want to just get the body text (article) and maybe even a few tab names here and there. I have tried the suggestion in this SO question that returns l...
Uniq by object attribute in Ruby
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The hash method is better if you want to group by say album_id while (say) summing up num_plays.
– thekingoftruth
Sep 13 '13 at 22:59
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