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Automatically capture output of last command into a variable using Bash?
...e`
echo $v
From Bash Beginners Guide,
When the old-style backquoted form of substitution is used, backslash retains its literal meaning except when followed by "$", "`", or "\". The first backticks not preceded by a backslash terminates the command substitution. When using the "$(COMMAND)" fo...
Create ArrayList from array
...s return value as is. It breaks the List template, so always use it in the form indicated here, even if it does seem redundant. Good answer.
– Adam
Jan 23 '13 at 3:28
84
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Difference between Fact table and Dimension table?
...se structure that can be queried in a very efficient way.
On its simplest form, it contains a fact table (Example: StoreSales) and a one or more dimension tables. Each Dimension entry has 0,1 or more fact tables associated with it (Example of dimension tables: Geography, Item, Supplier, Customer, T...
MySQL, better to insert NULL or empty string?
I have a form on a website which has a lot of different fields. Some of the fields are optional while some are mandatory. In my DB I have a table which holds all these values, is it better practice to insert a NULL value or an empty string into the DB columns where the user didn't put any data?
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Best practices for storing postal addresses in a database (RDBMS)?
...re frustrating than dealing with a website that is oriented around only US-format addresses. It's a little rude at first, but becomes a serious problem when the validation is also over-zealous.
If you are concerned with going global, the only advice I have is to keep things free-form. Different cou...
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 one being the illegal copy of another. The author of the copy may do stuff like rotating, making negative, or adding trivial details (as well as changing the dimension of the image).
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In C#, how to check if a TCP port is available?
...ports. There are lots of good objects available in the System.Net.NetworkInformation namespace.
Use the IPGlobalProperties object to get to an array of TcpConnectionInformation objects, which you can then interrogate about endpoint IP and port.
int port = 456; //<--- This is your value
bool...
How to add text to request body in RestSharp
...nt to insert XML into the body of my RestRequest in its already serialized form (i.e., as a string). Is there an easy way to do this? It appears the .AddBody() function conducts serialization behinds the scenes, so my string is being turned into <String /> .
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Is it a bad practice to use an if-statement without curly braces? [closed]
...amusing ways.
Maintainability-wise, it's always smarter to use the second form.
EDIT: Ned points this out in the comments, but it's worth linking to here, too, I think. This is not just some ivory-tower hypothetical bullshit: https://www.imperialviolet.org/2014/02/22/applebug.html
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Why is exception handling bad?
...ach error condition by introducing a return value for it. You will loose information about the error. Thinking that you can keep everything nicely synced by checking each and every statement and doing the cleaning up leads to very convoluted code - catching an error over multiple statements and clea...