Add Linux cheatsheet

Author: 0warie

CheatSheets/linux-cheatsheet.md

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+## Table of Contents
+---
+
+- [Linux CheatSheet for Developers](#linux-cheatsheet-for-developers)
+  - [File Commands](#file-commands)
+  - [File Permissions](#file-permissions)
+  - [Privilege Escalation](#privilege-escalation)
+  - [SSH](#ssh)
+  - [System Info](#system-info)
+  - [Shortcuts](#shortcuts)
+  - [Text Editors](#text-editors)
+
+# Linux CheatSheet for Developers
+
+## File Commands
+
+| Command | Description |
+| ------- | ----------- |
+| `pwd` | Show current directory | 
+| `mkdir dir` | Make directory called *dir* | 
+| `cd dir` | Change directory to *dir* |
+| `cd ..` | Go up a directory | 
+| `cd` | Change to home directory |
+| `ls` | List contents of directory|
+| `ls -al` | Formatted list of contents for the directory including hidden files |
+| `rm file` | Delete file | 
+| `rm -r dir` | Delete directory *dir* | 
+| `rm -f file` |Force delete file | 
+| `rm -rf dir` | Force delete directory *dir* | 
+| `cp file1 dir` | Copy *file1* to inside of *dir*| 
+| `mv file1 dir` | Move/Cut *file1* to inside of *dir*| 
+| `touch file` | Create *file*| 
+
+
+**[🔼Back to Top](#table-of-contents)**
+
+## File Permissions
+
+| Command | Description |
+| ------- | ----------- |
+| `chmod octal file` | Change the permissions of file to octal for user, group and world by adding: **4 - read( r ), 2 - write( w ), 1- execute ( x )**|
+| `chmod 777 file` | Read, write, execute for all| 
+| `chmod 755 file` | rwx for owner, rx for group and world.| 
+
+**[🔼Back to Top](#table-of-contents)**
+
+ ## Privilege Escalation
+ 
+| Command | Description |
+| ------- | ----------- |
+| `sudo command` | Runs *command* as root. (If a command requires a higher permission you might have to run it with sudo)|
+| `su` | Runs an interactive shell as root |
+
+**[🔼Back to Top](#table-of-contents)**
+
+## SSH
+
+| Command | Description |
+| ------- | ----------- |
+| `ssh user@host` | Connect to host as user |
+| `ssh -p port user@host` | Connect to host on port *port* as user|
+
+
+**[🔼Back to Top](#table-of-contents)**
+
+## System Info
+
+| Command | Description |
+| ------- | ----------- |
+| `date` | Show the system date and time |
+| `cal` | Show this month's calendar |
+| `uptime` | Show system's uptime |
+| `w` | See who is online |
+| `whoami` | See who you are logged in as|
+| `uname -a` | Show kernel information |
+| `man command` | Show the manual for any command (exit with **q**) 
+
+**[🔼Back to Top](#table-of-contents)**
+
+## Shortcuts
+
+| Command | Description |
+| ------- | ----------- |
+| `Ctrl + C` | Halts the current command |
+| `Ctrl + D` | Log out of current session |
+| `Ctrl + W` | Erases one word in current line |
+| `Ctrl + U` | Erases entire line |
+
+**[🔼Back to Top](#table-of-contents)**
+
+## Text Editors
+| Command | Description |
+| ------- | ----------- |
+| `nano file` | nano  is  a  small and friendly editor |
+| `vi file` | vi is a powerful text editor where every action is done though the keyboard. [How to exit vim/vi](https://www.cyberciti.biz/faq/linux-unix-exit-vim-editor/) (Trust me you'll need to know it) |
+| `vim file` | vim - Vi IMproved is an improved version of the vi editor. Like vi, every action is done through the keyboard.|
+
+**[🔼Back to Top](#table-of-contents)**