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Pointer variable Let's start from the beginning, computer memory location are layered out in addresses, each particular location have an address and holds some kind of content. The address is a numerical number usually in hex for easier expression. To help p...

https://stackoverflow.com/questions/3075130/what-is-the-difference-between-and-regular-expressions

Single Quote Using single quote in bash script will preserve the literal value of each characters in the single quotes. It will not do any variable interpolation but instead treat it as it is. Basically what you entered is what you will see. None of that esca...

Backslash in /regex/ Expression When you are trying to create a literal backslash match in Ruby, if you use the /regex/ expression, the backslash parsing are only done once. Meaning that \\ will become \ string literal. For example: /\\h/ will be matching th...

When using regular expression in find, you have to quote the name parameter to prevent glob expansion (the name expansion done by the shell) find . -name *.java vs find . name "*.java" The first method will expand to the files you have at the current d...

Multi-line Command To execute multi-line command in bash script simple put a \ after breaking up your commands. There should be no white spaces after the backslash, else it will fail! Every single line should be followed by a \ until you finished typing the ...

See link for valid information. This page is outdated. When you are working with special character arguments for say Python or Bash scripts, remember that if you only put one backslash it will escape the character that comes after it. In the case that the cha...

The escape string \033[0K will clear the entire line, this string are cross-platform so it will work on zsh, bash, ...etc. For zsh you can use the string \e[0K instead of 033

df - File System Disk Usage The command df reports the total disk usage on the mounted file system. For example, how much space is still available in the root partition, how much space is still left on the /dev/sda1 partition that you have created and where i...

https://www.computerhope.com/unix/udiff.htm#How%20diff%20Works

Grep Global Regular Expression Pattern With grep you can do simple text-based or regular expression search on the file you passed or can be also piped. You can only provide in one pattern, you can provide in multiple pattern to search for by using the pipe ...

Superblock Superblock is metadata about the filesystem. It define the name of the file system (ext4, ext2/3, FAT32). It defines their size, the status, and the structures of some other metadata. Superblock is vital to file system since they tell the OS how t...

1. Head to the official repository for Node.js distributio The link is right here:  https://github.com/nodesource/distributions. Head there and scroll down to find the correct command to copy and paste to install the version of Node you would like 2. Start N...

What is JavaScript It is a scripting language that is the core of websites, along with HTML and CSS, by learning scripting language you give interactivity to your web pages! Sliders, alerts, click interactions, popups, etc... Are all made possible with JavaS...

Script tag You can insert JavaScript program into HTML document using the <script> tags. You can write inline scripts directly between the tags or you can include external scripts. In order to include external script you would specify the src attribute for t...

Variables A named storage for storing data. There are couple way of creating a variable var keyword This is the relic of the past, back when JavaScript first came out it was the only way of declaring variables with the var keyword. Variable declared with ...

String Conversion You can call the String() function to explicit convert a value to a string String(false) -> "false" String(null) -> "null" Numeric Conversion Occurs when you use math functions and expressions console.log("6" / "2"); // Print out 3! Or...

Math Operators +, addition -, subtraction *, multiplication /, division %, remainder **, exponentiation String Operators The plus symbol if used with Strings will be for concatenation, you join two String together. If any of the operand is a String, th...

Ternary Operator let accessAllowed; if (age > 18) { accessedAllowed = true; } else { accessedAllowed = false; } // Can be simplified into just accessedAllowed = age > 18 ? true : false; || (OR) Returns true if one of the boolean value is tru...

While and for loop They are the same as in Python, C, and Java while (condition) { // Repeat certain code } for (begin; condition; step) { // Repeat certain code } break and continue both works the same way as in any other language. Switch state...