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linux - How do I grep recursively?

How do I recursively grep all directories and subdirectories? find . | xargs grep "texthere" * Question&Answers:os...

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Sync data between Android App and webserver

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algorithm - Why is quicksort better than mergesort?

I was asked this question during an interview. They're both O(nlogn) and yet most people use Quicksort instead of Mergesort. Why is that? Question&Answers:os...

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How can I call controller/view helper methods from the console in Ruby on Rails?

When I load script/console, sometimes I want to play with the output of a controller or a view helper ... either via said controller instance or another way? Question&Answers:os...

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Algorithm to compare two images

Given two different image files (in whatever format I choose), I need to write a program to predict the chance if ... know any algorithm to do this kind of job? Question&Answers:os...

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python - How to reversibly store and load a Pandas dataframe to/from disk

Right now I'm importing a fairly large CSV as a dataframe every time I run the script. Is there a good ... all that time waiting for the script to run? Question&Answers:os...

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c# - Interfaces — What's the point?

The reason for interfaces truly eludes me. From what I understand, it is kind of a work around for the non-existent ... void Order() { //Order HawaiiPizza } } Question&Answers:os...

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java - How to activate JMX on my JVM for access with jconsole?

How to activate JMX on a JVM for access with jconsole? Question&Answers:os...

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Python Image Library fails with message "decoder JPEG not available" - PIL

PIL does support JPEG in my system. Whenever I do an upload, my code is failing with: File "PIL/Image.py ... decoder jpeg not available How can I resolve this? Question&Answers:os...

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How do I create a ListView with rounded corners in Android?

How do I create a ListView with rounded corners in Android? Question&Answers:os...

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Difference between jar and war in Java

What is the difference between a .jar and a .war file? Is it only the file extension or is there something more? Question&Answers:os...

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mysql - Storing JSON in database vs. having a new column for each key

I am implementing the following model for storing user related data in my table - I have 2 columns - uid ( ... JSON for others (in the same MySQL database)? Question&Answers:os...

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What's the difference between "Normal Reload", "Hard Reload", and "Empty Cache and Hard Reload" in Chrome?

I recently discovered this new feature in Chrome: I can figure out the difference between option 1 and option 3, ... precise behavior of each of the 3 options? Question&Answers:os...

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css - iPad Safari scrolling causes HTML elements to disappear and reappear with a delay

I'm currently developing a web application using HTML5 and jQuery for iPad Safari. I'm running into a problem ... what is iPad Safari actually trying to do? Question&Answers:os...

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Disable LESS-CSS Overwriting calc()

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oop - Method chaining - why is it a good practice, or not?

Method chaining is the practice of object methods returning the object itself in order for the result to be ... it breaks the inherent object-oriented notation. Question&Answers:os...

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c - How to know what the 'errno' means?

When calling execl(...), I get an errno=2. What does it mean? How can I know the meaning of this errno? Question&Answers:os...

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How to search for a part of a word with ElasticSearch

I've recently started using ElasticSearch and I can't seem to make it search for a part of a word. ... documentation on using nGram isn't great... Question&Answers:os...

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class - Get an object properties list in Objective-C

How can I get a list (in the form of an NSArray or NSDictionary) of a given object properties in Objective-C? ... , so I can later use these NSString for KVC? Question&Answers:os...

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haskell - Applicatives compose, monads don't

Applicatives compose, monads don't. What does the above statement mean? And when is one preferable to other? Question&Answers:os...

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javascript - React useEffect in depth / use of useEffect?

I am trying to understand the useEffect hook in-depth. I would like to know when to use which method and why? 1 ... the second parameter useEffect(()=>{},[arg]) Question&Answers:os...

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php - SQL injections in ADOdb and general website security

I have done pretty much reading and still don't understand 100% how some of the SQL injections happen! I' ... use the concrete examples. Thanks in advance, Ilia Question&Answers:os...

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sql server - Construct date from year and week number in MSSQL

If I have a YEAR and a WEEK number, what's a clean way to construct a DATE from this? I'd prefer it if the day of the week could be a Monday. Question&Answers:os...

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Why does '.sort()' cause the list to be 'None' in Python?

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Ruby: String Comparison Issues

I'm currently learning Ruby, and am enjoying most everything except a small string comparason issue. answer = gets() if ... ? (sp), that returns bubcus as well) Question&Answers:os...

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javascript - Angular2/Spring Boot Allow Cross Origin on PUT

I have a little problem on my web application: an angular2 app connected to a spring boot API. I can't ... I can use PUT methods without getting this error? Question&Answers:os...

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javascript - How to clear the contents of an iFrame from another iFrame

I have a wrapperPage.html with an <iframe class="header" and <iframe class="pageBody". In header there is a link, ... class="panel-body">This is the body</div> Question&Answers:os...

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python - Pyinstaller Unable to access Data Folder

Below is the game.spec file that I have created. When running the below command, the app gets created ... 'game.app', icon=None, bundle_identifier=None) Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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