Reverse Print File Content in Linux Terminal

Introduction

In this project, you will learn how to reverse print a Linux terminal command using SQL statements in the MySQL client. This project is designed to help you understand the basics of SQL and how to use it to perform simple operations on text data.

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🎯 Tasks

In this project, you will learn:

How to access the MySQL database without a password using the sudo command
How to write an SQL statement to reverse the cat command
How to save the SQL statement to a file
How to run the SQL script in the MySQL client

🏆 Achievements

After completing this project, you will be able to:

Understand how to use SQL statements to manipulate text data
Learn how to save and execute SQL scripts in the MySQL client
Gain experience in using the MySQL client and performing basic database operations

Skills Graph

%%%%{init: {'theme':'neutral'}}%%%% flowchart RL mysql(("`MySQL`")) -.-> mysql/BasicKeywordsandStatementsGroup(["`Basic Keywords and Statements`"]) sql(("`SQL`")) -.-> sql/BasicSQLCommandsGroup(["`Basic SQL Commands`"]) sql(("`SQL`")) -.-> sql/DataManipulationandQueryingGroup(["`Data Manipulation and Querying`"]) mysql/BasicKeywordsandStatementsGroup -.-> mysql/source("`External Code Execution`") sql/BasicSQLCommandsGroup -.-> sql/select("`SELECT statements`") sql/DataManipulationandQueryingGroup -.-> sql/in("`IN clause`") mysql/BasicKeywordsandStatementsGroup -.-> mysql/select("`Data Retrieval`") mysql/BasicKeywordsandStatementsGroup -.-> mysql/use_database("`Database Selection`") subgraph Lab Skills mysql/source -.-> lab-301402{{"`Reverse Print File Content Command`"}} sql/select -.-> lab-301402{{"`Reverse Print File Content Command`"}} sql/in -.-> lab-301402{{"`Reverse Print File Content Command`"}} mysql/select -.-> lab-301402{{"`Reverse Print File Content Command`"}} mysql/use_database -.-> lab-301402{{"`Reverse Print File Content Command`"}} end

Access MySQL Without a Password

In this step, you will learn how to access the MySQL database using the sudo command without any password.

Open a terminal on your Linux system.
Start the MySQL service by running the following command:

sudo service mysql start

Access the MySQL client by running the following command:

sudo mysql

This will allow you to access the MySQL database without a password.

Reverse Print the ‘Cat’ Command

In this step, you will learn how to write an SQL statement to reverse print the cat command in the Linux terminal.

In the MySQL client, run the following SQL statement:
```
SELECT REVERSE('cat');
```
This will reverse the string 'cat' and display the output 'tac'.
In the MySQL client, run the following command to save the SQL statement to the file:
```
SELECT REVERSE('cat');
```
This will create the reverseCat.sql file in the /home/labex/project directory and save the SQL statement to it.

Run the SQL Script

In this step, you will learn how to run the reverseCat.sql script in the MySQL client.

In the MySQL client, run the following command to execute the script:
```
SOURCE /home/labex/project/reverseCat.sql;
```
This will execute the SQL statement in the reverseCat.sql file and display the output 'tac'.

Congratulations! You have completed the project. You should see the following output:

MariaDB [(none)]> SOURCE /home/labex/project/reverseCat.sql;
+----------------+
| REVERSE('cat') |
+----------------+
| tac            |
+----------------+
1 row in set (0.000 sec)

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