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feat: Add redirections and piping, Permisions Managment and pattern s… #105

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144 changes: 125 additions & 19 deletions README.md
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</p>

## Table of Contents
1. [Basic Operations](#1-basic-operations)
1.1. [File Operations](#11-file-operations)
1.2. [Text Operations](#12-text-operations)
1.3. [Directory Operations](#13-directory-operations)
1.4. [SSH, System Info & Network Operations](#14-ssh-system-info--network-operations)
1.5. [Process Monitoring Operations](#15-process-monitoring-operations)
2. [Basic Shell Programming](#2-basic-shell-programming)
2.1. [Variables](#21-variables)
2.2. [Array](#22-array)
2.3. [String Substitution](#23-string-substitution)
2.4. [Other String Tricks](#24-other-string-tricks)
2.5. [Functions](#25-functions)
2.6. [Conditionals](#26-conditionals)
2.7. [Loops](#27-loops)
3. [Tricks](#3-tricks)
4. [Debugging](#4-debugging)
5. [Multi-threading](#5-multi-threading)

1. [Basic Operations](#basic-operations)
1.1. [File Operations](#file-operations)
1.2. [Text Operations](#text-operations)
1.3. [Directory Operations](#directory-operations)
1.4. [SSH, System Info & Network Operations](#ssh-system-info--network-operations)
1.5. [Process Monitoring Operations](#process-monitoring-operations)
1.6. [Redirections and Piping](#redirections-and-piping)
1.6.1. [`>`](#greater-than)
1.6.2. [`>>`](#double-greater-than)
1.6.3. [`|`](#pipe)
1.7. [Permission Management](#permission-management)
1.7.1. [chmod](#chmod)
1.7.2. [chown](#chown)
1.7.3. [chgrp](#chgrp)
1.8. [Pattern Search and Manipulation](#pattern-search-and-manipulation)
1.8.1. [grep](#grep)
1.8.2. [awk](#awk)
1.8.3. [sed](#sed)

2. [Basic Shell Programming](#basic-shell-programming)
2.1. [Variables](#variables)
2.2. [Array](#array)
2.3. [String Substitution](#string-substitution)
2.4. [Other String Tricks](#other-string-tricks)
2.5. [Functions](#functions)
2.6. [Conditionals](#conditionals)
2.7. [Loops](#loops)
2.8. [Working with History](#working-with-history)
2.8.1. [history](#history)
2.8.2. [History Shortcuts and Tricks](#history-shortcuts)
2.9. [Advanced Shell Programming](#advanced-shell-programming)
2.9.1. [trap](#trap)
2.9.2. [getopts](#getopts)
2.10. [Interacting with Other Languages](#interacting-with-other-languages)
2.10.1. [Executing Other Languages](#executing-other-languages)
2.10.2. [Running SQL Commands from Bash](#sql-from-bash)
2.11. [Use of Additional Tools](#use-of-additional-tools)
2.11.1. [tmux](#tmux)
2.11.2. [wget](#wget)

3. [Tricks](#tricks)
3.1. [Best Practices](#best-practices)
3.1.1. [Writing Style](#writing-style)
3.1.2. [Tips for Maintainability](#maintainability-tips)
3.2. [Environments and Profiles](#environments-and-profiles)
3.2.1. [`.bashrc vs .bash_profile`](#bashrc-vs-bash_profile)
3.2.2. [Custom Aliases](#custom-aliases)
3.3. [Package and Software Management](#package-and-software-management)
3.3.1. [Package Managers](#package-managers)
3.3.2. [Installation from Source Code](#source-code-installation)
3.4. [Archiving and Compression](#archiving-and-compression)
4.1. [tar](#tar)
4.2. [Compression Tools](#compression-tools)
4. [Debugging](#debugging)
5. [Multi-threading](#multi-threading)

# 1. Basic Operations

### a. `export`
Displays all environment variables. If you want to get details of a specific variable, use `echo $VARIABLE_NAME`.
Displays all environment variables. If you want to get details of a specific variable, use `echo $VARIABLE_NAME`.
```bash
export
```
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nohup command &
```

# 2. Basic Shell Programming
## 1.6. Redirections and Piping

<table>
<tr>
<td><a href="#a-input,output,errorRedirection">Input,Output, and Error Redirection</a></td>
<td><a href="#b-pipe">Using pipe '|' to connect commands</a></td>
</tr>
</table>

### a. `imput,output,errorRedirection`
Redirects input, output, or errors to/from files or commands.
```bash
command > output.txt # Redirects output
command 2> error.txt # Redirects errors
command < input.txt # Redirects input
```
Example:
```
$ echo "Hello, World!" > hello.txt
$ cat < hello.txt
Hello, World!
```

### b. `pipe`
Pipe the output of one command into another
```bash
command1 | command2
```
Example:
```bash
$ echo "Hello, World!" | awk '{print $2}'
World!
```

## 1.7. Permisions managment

<table>
<tr>
<td><a href="#a-chmod">chmod</a></td>
<td><a href="#b-chown">chown</a></td>
<td><a href="#b-chgrp">chgrp</a></td>
<td><a href="#b-umask">umask</a></td>
</tr>
</table>

### a. `chmod`
Change files permissions.
```bash
chmod [permissions] [file]
```

### b. `chown`
Change file owner
```bash
chown [owner]:[group] [file]
```

### c. `chgrp`
Change group ownership of a file
```bash
chgrp [group] [file]
```

### d. `umask`
Set default permisions for newly created files
```bash
umask [value]
```
# 2. Basic Shell Programming

The first line that you will write in bash script files is called `shebang`. This line in any script determines the script's ability to be executed like a standalone executable without typing sh, bash, python, php etc beforehand in the terminal.

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