What's the difference between set, export and env and when should I use each?


Beginning with the common feature of import and export is the moving of the products in an official way from one destination (country) to another (country), what differentiates the terms is "export" - products leave the country and "import" products are received by the country. To do this, quite an amount of time is spent on documentation for both parties. But you have the opportunity to save a lot of time including many other actions by using Export Portal. Export Portal is the new International Import and Export Organization with new implemented features like never before. As for documentation, we provide both consultancy and after the order is done, an automated official invoice is created with all the specific regulations according to the countries involved in the transaction (or region if it is the case) with the type of products into consideration. Also there are 5 types of orders to suit everybody's case, Verified Sellers/Manufacturers and Verified Shippers, both...

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With a multi-core CPU, each core can do its own thing. To a programmer, it works exactly like you'd expect a multi-core system to work: you can launch threads on all cores and run completely different, individual tasks on all of them. The biggest multi-core CPUs from AMD have about 16 cores (while I believe the biggest Intel CPUs have 12 cores), and with high-end server motherboards you can usually cram several of these into a single computer, giving you a maximum of around 60 or so cores on a conventional machine.

With a GPU, you instead can have hundreds or thousands of cores running hundreds or thousands of threads at once. However, there is one important limitation: you can't run different code on each thread concurrently. GPU architecture limits you to running the same code on all your threads at once. You load your data into memory and run one operation at a time (small pieces of code called "kernels" or "shaders") on the entire data array. The scheduler launches...

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Main Difference – Each vs. Every

Both words, each and every are used with singular nouns and have similar meanings. We use both words to refer to individuals in a group. However, they cannot be used interchangeably as their meaning is not identical. The main difference between Each and Every is that each stresses individual components, people of a group, while every stresses all the components or members of the group.

Each – Meaning and Usage

Each is used to refer to individual things in a group or a list containing two or more things. It is always used with singular nouns and, therefore, the verb is also conjugated in the singular (if each is used with the subject). For example, look at the sentences below.

Each one of you has to give 10$

I checked each box to make sure that there were no faults.

Each child was given a pen and paper to write.

Each can also be used as an adverb. In such instances, each is placed after a noun or an...

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How to run Express.js in production mode

So you have become a Node.js developer and have ever since started churning out kickass Express.js apps by the dozens. But you have a little secret - you still can't figure how to run your Express.js app in production mode. All your apps run in development mode:

Express server listening on port 3000 in development mode

How do you run Express in production mode? Do I need to edit a config file or something? Do I need to set some variables in app.js? What is the difference between development and production mode? Can someone tell me what to do?! This post will answer all these question and more.

I am gonna show you how to run your app in production mode. But be warned that should you run your app in production mode in any environment other than production, you are inviting 20 days and 21 nights of unfathomable pain.

Considering the current state of Node.js and Windows, I will assume your production server is a...

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Each vs Every

Let us examine the differences between these two seemingly similar words by beginning with examples: “Each and every one of us, owes duties towards the nation in which we reside’. Here, both the words have been used, but it is very clear that every needs another word (which could be anything – ‘one’, ‘man’, ‘woman’, ‘child’, ‘thing’, etc) to complete its meaning.

‘Each’ refers to one, and ‘every’ refers to all. Both are usually used together in the phrase ‘each and every’ to connote the impact.

‘Each’ and ‘every’ can also be used in the exact same sentence, but there are more suitable uses for the former, and sometimes it is more suitable to use the latter. For example: “Each man for himself’, ‘Every man for himself’, ‘Each item should be listed’, ‘Every item should be listed’. All four of the previous sentences seem correct at first, but you will realize that each is more human, and every is more for ‘things’. Thus, the first and the last of the...

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by Ravindar

I have one question. Sometimes when I speak I wonder how can I can know when to put the correct word of use "AT" " and or "IN".

I am in the class,
I am at the factory,
I am at the bank,
He is at home...etc

Thanks for your continious continuous posting Diana.

Hi Ravindar,

Thanks for asking! This is not a silly question. Many people find prepositions difficult. Regarding the difference between AT and IN, here is a general explanation.

You probably already know that both AT and IN are used to describe position, but there are some differences.

Here are some rules;


-AT describes position at a specific point.
It's very cold at the bottom of the ocean.

-AT is also used with a larger place (a store, bank, airport etc)
Let's meet at the bank

-AT is used before the names of group activities at a party, at a meeting, at a play, at a...

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MVC stands for Model, View, Controller which means3 layers are used to create website. Models contain classes based on application's logic to manipulate data from database. Views are the templates to display data or content to user or get data from user. Controllers are the classes used to control the flow of the application like routing. Examples are Symfony2, Zend Framework, CodeIgnitor e.t.c.

CMS is the Content Management System which contains Page Management , Post Management, Category, User Management, Theme Management, Module or Plugin Management to extent it and Images Management. Examples are Wordpress, Drupal, Joomla e.t.c.

CMS may or may not use MVC pattern.

CMS is used for websites displaying contains on different pages and have general forms like register, contact us e.t.c and eCommerce.

MVC is used for websites have some purpose having large data like expert system, website with uncommon or unique functionalities.

In am giving an...

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I know that variations of this question has been asked here multiple times, but I’m not asking what is the difference between the two. Just would like some help understanding the assembly behind both forms.

I think my question is more related to the whys than to the what of the difference.

I’m reading Prata’s C Primer Plus and in the part dealing with the increment operator ++ and the difference between using i++ or ++i the author says that if the operator is used by itself, such as ego++; it doesn’t matter which form we use.

If we look at the dissasembly of the following code (compiled with Xcode, Apple LLVM version 9.0.0 (clang-900.0.39.2)):

int main(void) { int a = 1, b = 1; a++; ++b; return 0; }

we can see that indeed the form used doesn’t matter, since the assembly code is the same for both (both variables would print out a 2 to the screen).

Initializaton of a and b:

0x100000f8d : movl $0x1, -0x8(%rbp) 0x100000f94 : movl $0x1,...
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Oracle 8i introduced the CONTEXT index type - a "domain" index that was used for fast retrieval of unstructured text.

In Oracle 8i Release 3 (Version 8.1.7), Oracle introduced a new type of index - the "catalog" or CTXCAT index type. The name derives from the main purpose of the index type - online catlogs.

When should I use a CTXCAT index?

CTXCAT indexes work best when text is in "small chunks" - maybe a couple of lines maximum - and searches need to restrict and/or sort the result set according to certain structured criteria - usually numbers or dates.

For example, lets consider an on-line auction site. Each item for sale has a short description, a...

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I want to get maximum and minimum stock for each product and calculate the difference between these values. If a stock is equal to null or is empty, then it should be substituted by 0.

This is my code:

import org.apache.spark.sql.functions._ import org.apache.spark.sql.expressions._ val windowSpec = Window.partitionBy("product_pk") val sales = df .select($"product_pk",$"stock") .withColumn("sold",max($"stock")-min($"stock").over(windowSpec))

But I get this error when I run my code. I do not understand why I cannot use Window with product_pk:

diagnostics: User class threw exception:
org.apache.spark.sql.AnalysisException: grouping expressions sequence
is empty, and ‘mytable.product_pk‘ is not an aggregate function.
Wrap ‘(max(mytable.stock) AS _w0)’ in windowing function(s) or
wrap ‘mytable.product_pk‘ in first() (or first_value) if you don’t
care which value you get.;;

Or should I use groupBy...

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What’s the difference between set, export and env and when should we use each?

This is a repost from StackExchange ask Ubuntu community.

Setting Variables

Let us consider a specific example. The grep command uses an environment variable called GREP_OPTIONS to set default options.

Now. Given that the file test.txt contains the following lines:

running the command grep one test.txt will return

If you run grep with the -v option, it will return the non-matching lines, so the output will be

We will now try to set the option with an environmental variable.

Environment variables set without export will not be inherited in the environment of the commands you are calling.

The result:

Obviously, the option -v did not get passed to grep.

You want to use this form when you are setting a variable only for the shell to use, for example in for i in * ; do you do not want to...

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