Gain insights into the power of the command line. Learn about Linux BASH through theoretical and practical exercises, mastering essential concepts and commands for efficient programming.

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

# man
## Definition: 
`man` is used to format or display the _manual pages_. Manual pages or _man pages_ are the official documentation of all shell commands that comes along with the Linux distributions.
$$$$
## Syntax: 
```shell
man [option(s)] keyword(s)
```

In order to display manual page from specific section:
```shell
man [section-num] [command/tool name]
```
$$$$
## Section Numbers: 
| **Section No.** | **Section Description** |
| --- | --- |
| 1 | Programs or shell commands |
| 2 | System calls (functions provided by the kernel) |
| 3 | Library calls (functions within program libraries) |
| 4 | Special files (usually found in /dev) |
| 5 | File formats and conventions eg /etc/passwd |
| 6 | Games and demonstrations |
| 7 | Miscellaneous (including macro packages and conventions), e.g., man, groff |
| 8 | System administration commands (usually only for root) |
| 9 | Device driver interfaces |

## Options: 
| **Option** | **Syntax** | **Meaning** |
| --- | --- | --- |
| -s | `man <section num> <command>` | To specifically view a section of a man page. |
| -a | `man -a <command>` | To display all manual pages where a command exists.|
| -w | `man -w [command/tool name]` | To view the location for man pages. |
| -I | `man -I [command/tool name]` | To enable case-sensitivity while searching for man pages |
| -H | `man -H[browser-command] [command/tool name]` | To display manual pages in web browser. |
| -f | `man -f [command/tool name]` | To lookup for manual pages and display short descriptions as well. |

## Example: 
To get information about the `ls` command:
```shell
man ls
```

Brush up on how to get information about bash commands via command line.

Introduction to Bash

Navigation Commands

File Manipulation Commands

Permission Commands

Filtering & Searching Commands

System & Process Commands

Variables and Environment

An Overview of Commands

Getting Info about Commands

man

Definition: