Mastering Linux Commands with AWS Applications (Day 3)

What is Linux?

Linux is an open-source operating system that has become incredibly popular due to its flexibility, security, and the strong community of developers that support it. Linux is free to use and modify, making it an excellent choice for those who want to have more control over their computing environment

Why Use Linux?

Linux is one of the most popular platforms on the planet. It has been around since the mid-1990s and has since reached a user-base that spans the globe. Even Android is powered by the Linux operating system.

Moreover, there are several compelling reasons to use Linux:

• Security: Linux is known for its robust security features.
• Customizability: You can tailor Linux to meet your specific needs.
• Performance: Linux can run on a wide range of hardware, from powerful servers to old laptops.

Creating account on AWS and Running a linux :

• after creation of free tier :Go to EC2 dashboard and select Launch

• then select ubuntu as operating system and choose free tier availability

• for secure access we need a key for authorization click create new

• you will get success status within seconds of creation

• now you can connect to you AWS Linux machine and use CLI

LINUX COMMANDS

• Basic Linux Commands: ls, cd, cp, mv, rm
• File Permissions: chmod, chown
• Network Configuration: ifconfig, netstat
• Process Management: ps, top, kill
• Package Management: apt-get

FILE SYSTEM NAVIGATION COMMANDS:

 Directory contains implicitly 2 directories :
. and ..
. -->represents current directory
.. -->represents parent directory

$cd. -->changes to current directory 
$cd.. -->changes to parent directory
$cd --> If we are not passing any argument,Then changes to user home directory
$cd~ -->changes user home directory
$cd- -->changes to previous working directory        

1. To view what’s written in a file.

cat filename        

vim filename        

nano filename        

pwd current directory        

touch | mkdir new file&folder        

2. To change the access permissions of files.

chmod 777 filename        

3. To remove a directory/ Folder.

rm -rf filename        

rmdir filename        

Note: you need to empty folder before deleting it otherwise it gives error

4. To check which commands you have run till now.

history        

5. Show only the top | bottom three fruits from the file.

head -3 fruits.txt        

tail -3 fruits.txt        

Remember, this is just the beginning. The Linux command-line interface is vast and offers countless other commands and possibilities. So, keep exploring, experimenting, and expanding your knowledge to unleash the true potential of Linux!