Computer science

Often companies will release alpha and beta versions of the software. These are testing phases of software development process. During alpha and beta testing not final version of the software will be available to the people from public. This is done to involve as many people as many people as possible to test the software.

User-centered design is a process of creating the application considering demands of users. One of the ways to implement user-centered design is to get feedback from users.  There are several aspects what a user needs to focus on: Useability - is it easy to use features of the application. Accessibility - is the application available to majority of people. For example users with poor vision may rely on audible feedback. Well designed application with this feature will support as many people as possible. For example the application will provide bigger font size or audible feedback. Accessibility - can the application be used by as many people as possible? Content - does the application provide well crafted content?

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String variable type in programming is a collection of characters. Strings in programming are enclosed in single or double quotes. A person who creates a string object needs to be consistent with opening and closing quotes. If a single quote is used for start of a string, then single quote needs to indicate where it ends. YouTube video

Sticking to a specific format of naming the variables will make code looks nice. It will also remove confusion from a developer of how to format a variable. Common variable naming formats are: Upper case characters and underscores separating words. Even so this one of the variable naming formats, it is a good practice of using upper case letters for constants. Pascal case. First letter of each word is capitalized. Camel case. First letter of first word is lower case, all of the following first letters of each word are capitalized. Camel case is also known as mixed case. Capitalized with underscores. Each word in a variable name is separated by the underscore character.

​Copying a file in Linux is done using ‘cp’ command. Command ‘cp’ is short for word copy. There are a number of command switches for ‘cp’ command. One of the useful switches is -r of -R. Both lowercase and uppercase options are supported. Long form of it will be --recursive. It will copy recursively files and folders.