Ever wondered why command line is still in use even when there are hundreds of human-friendly GUI’s and tools available? Everyone in the programmer's world would agree on one thing: Command Line is far more powerful than any GUI. It provides a richer experience in terms of speed and expressiveness.

For beginners, it might be hard to appreciate its beauty and a little challenging to shift from an interactive interface to a blank box with just a “$” sign showing that keeps prompting the user to enter complex commands if you want to get something done. This is why we felt the need to build a course which could help the user overcome his/her fear of using the terminal (we have all been there).

The objective of this course is to help you get a strong grip over Linux, mainly focusing on BASH. You will be covering both, the theoretical and practical sides. First, you will learn a bunch of concepts necessary to understand things and then study some nifty commands to get useful things done out of them.

Bash for Programmers

> Regular expressions are a powerful way to filter out specific pieces of information by using various arithematic patterns to describe certain set of strings.

You are probably now familiar with the _wildcards_ e.g. ***.txt** to find all text files in some directory. Its regex would be something like this: `^.*\.txt$.`.

Some very important bash commands like `grep` and `egrep` use regex to search for different patterns of texts in inputs and files. Given below is a summary to make you aware of what various regex notations mean.

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## Regex Pattern Notations:

> Regular expressions are a powerful way to filter out specific pieces of information by using various arithematic patterns to describe certain set of strings.

You are probably now familiar with the _wildcards_ e.g. ***.txt** to find all text files in some directory. Its regex would be something like this: `^.*\.txt$.`.

Some very important bash commands like `grep` and `egrep` use regex to search for different patterns of texts in inputs and files. Given below is a summary to make you aware of what various regex notations mean.

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# Regex Pattern Notations:

> Regular expressions are a powerful way to filter out specific pieces of information by using various arithematic patterns to describe certain set of strings.

You are probably now familiar with the _wildcards_ e.g. ***.txt** to find all text files in some directory. Its regex would be something like this: `^.*\.txt＄.`.

Some very important bash commands like `grep` and `egrep` use regex to search for different patterns of texts in inputs and files. Given below is a summary to make you aware of what various regex notations mean.

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# Regex Pattern Notations:

This lesson gives a conceptual summary of regular expressions.

Introduction to Bash

Navigation Commands

File Manipulation Commands

Permission Commands

Filtering & Searching Commands

System & Process Commands

Variables and Environment

An Overview of Commands

Regular Expressions (Regex)

Regex Pattern Notations: