Linux Commands and File System Hierarchy

During my learning journey at Millennium Software Solutions, I explored Linux fundamentals, file system hierarchy, and commonly used commands that are essential for every software developer, system administrator, and DevOps engineer.

Linux is one of the most widely used operating systems in servers, cloud platforms, and development environments.

In this article, I’ll explain:

What is Linux Linux File System Hierarchy Common Linux Commands File Management Commands User Commands Process Commands Network Commands Permission Commands

What is Linux?

Linux is an open-source operating system based on Unix.

It manages:

hardware software memory processes files

Linux was created by Linus Torvalds in 1991.

Features of Linux

Open source

Secure Stable

Multiuser

Multitasking

Portable

Linux is used in:

Servers

Cloud computing

Cybersecurity

Networking Software development

Examples of Linux distributions:

Ubuntu

Fedora

Linux Debian

Linux File System Hierarchy

Linux uses a tree structure.

Everything starts from:

This is called Root Directory.

Important Directories /root

Admin user home directory.

/root /home

Stores user folders.

/home/kavya /bin

Contains basic commands.

Examples:

cat

/sbin

System admin commands.

Examples:

reboot shutdown /dev

Device files.

Examples:

/dev/sda /etc

Configuration files.

Examples:

/etc/passwd /usr

Applications and libraries.

/var

Variable files like logs.

Example:

/var/log /opt

Optional software.

/mnt

Temporary mount point.

/media

External devices.

Common Linux Commands

Print current directory.

pwd

Output:

/home/kavya 2. ls

List files.

Options:

ls -l ls -a

3. cd

Change directory.

cd Documents

Back:

cd ..

4. mkdir

Create folder.

mkdir project

5. rmdir

Remove empty folder.

rmdir folder

6. touch

Create file.

touch notes.txt

7. cat

Display file.

cat notes.txt

8. cp

Copy files.

cp file1 file2

9. mv

Move or rename.

mv old.txt new.txt

10. rm

Delete file.

rm file.txt

Delete folder:

rm -r folder

User Commands

whoami whoami

Shows current user.

passwd passwd

Change password.

Process Commands

ps ps

Show running processes.

top top

System monitoring.

kill kill 1234

Stops process.

Permission Commands chmod chmod 777 file.txt

Changes permissions.

chown chown user file.txt

Changes owner.

Network Commands ping ping google.com

Checks connectivity.

ip ip addr

Shows IP address.

ifconfig ifconfig

Network details.

Package Management

Ubuntu:

Update packages

sudo apt update

Install package

sudo apt install git

Why Learn Linux Commands?

Linux commands help in:

file management

server administration

cloud computing

DevOps

cybersecurity

automation

Most servers in the world run Linux.

Learning Linux gives strong foundation in IT and software development.

Conclusion

Linux is a powerful operating system widely used across servers, cloud, and development environments.Understanding Linux commands and file structure helps beginners:navigate systems manage files control processes configure networks secure systemsLearning these basics at Millennium Software Solutions helped me strengthen my understanding of operating systems and server environments.

Tags

#Linux #Unix #Commands #OperatingSystem #SoftwareDevelopment #DevOps #CloudComputing #Hashnode #LearningJourney