Markdown Notes

Learn the basics of Markdown, the lightweight markup language with plain text formatting syntax.

Undestand and be able to use markdown is one of essential skills for IT Professional.

Heading

Here are 6 headings, from 1 to 6.

# H1
## H2
### H3
#### H4
##### H5
###### H6

Paragraph

This is a sample paragraph. Add a blank line or at least 2 trailing spaces.

Blockquote

> You are what you practice most. — Author

Unordered list

- Learn
- Practice
- Share
- Loop

Ordered list

1. Plan
2. Do
3. Check
4. Act

Hyperlink

[Quote of the Hour](http://www.practicehabits.net)

Table

| Date       | Version | Changed by | Change Description |
| :---       |    ---: |       ---: | :---               |
| 2021-05-11 |   0.0.1 | xxxxs xxxx | Initial version    |

nmap - The Network Mapper

WARNING : It is ILLEGAL to scan hosts without permission.

Linux command: xargs

xargs - build and execute command lines from standard input

command1 ; command2 ; command3 command1 is executed, then command2, and then command3 command1 && command2 && command3 command2 is executed only if command1 run successfully (exit code is 0), command3 is executed only if command2 run successfully (exit code is 0) command1 || command2 || command3 command2 is executed only if command1 exit code is 0 (failure), command3 is executed only if command2 exit code is 0 (failure)

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