In the ever-evolving world of technology, cloud computing and DevOps have emerged as cornerstones of modern software development and infrastructure management. As a developer looking to harness the power of these transformative paradigms, you're stepping onto a path filled with opportunities and challenges. But before you embark on your journey through the cloud and dive into the depths of DevOps, there's one essential skill you must master: Linux.

Linux, often referred to as the "heart" of the open-source movement, plays a pivotal role in the world of cloud computing and DevOps. It's the operating system of choice for a vast majority of cloud servers and the cornerstone of countless DevOps toolchains. Whether you're planning to work with AWS, Azure, Google Cloud, or any other cloud provider, a solid foundation in Linux is not just valuable—it's indispensable.

This blog post is your key to unlocking the world of cloud and DevOps. I've curated a list of 20 Essential Linux Commands that every developer must know. But this isn't just another list; it's a guide tailored to your journey towards mastering the cloud and DevOps. By the end of this post, you'll have a firm grasp of these essential Linux commands, setting the stage for your future success in the realms of cloud computing and DevOps.

So, whether you're a seasoned developer looking to bolster your skills or a newcomer eager to dive into the world of cloud and DevOps, fasten your seatbelt and get ready to explore the Linux command-line universe. Let's begin your journey to becoming a cloud and DevOps virtuoso, one command at a time.

Getting Started: Your First 20 Linux Commands

ls

It is short of List. The 'ls' command is your go-to tool for listing files and directories within the current working directory or a specified path. It stands as one of the most frequently employed commands in Linux and is often the very first command newcomers encounter in their Linux journey.

While the 'ls' command offers numerous arguments, two of the most vital ones are '-a' and '-l.' The '-a' flag, represented as '--all,' plays a pivotal role by revealing files that start with a dot ('.'). On the other hand, '-l' presents the file list in a detailed long list format, offering comprehensive information about each item. In Linux, it's possible to use multiple arguments simultaneously.

In the long list format, file permissions are displayed for files and directories. Specifically, when the string begins with 'd,' it denotes a directory; with '-', it signifies a regular file, and 'l' designates a symbolic link.

cd

cd is the short form of Change Directory. The 'cd' command is your tool for moving around and exploring different folders within your computer's file system.

cd - takes you back to the previous directory you were in.

pwd

The 'pwd' command lets you display the directory you are currently working in.

mkdir

The 'mkdir' command enables you to make new directories directly from the terminal. To use it, simply type 'mkdir' followed by the desired directory name.

To create nested directories, specify the desired directory structure by providing the path

To avoid errors when creating multiple nested directories in a specified path, you can use the '-p' argument with the command. It ensures that all necessary directories in the path are created if they don't already exist.

touch

Utilized to generate an empty file.

The fourth column in the list displays the file size, with '0' indicating that the file is empty and contains no content.

rmdir

The 'rmdir' command comes in handy when an empty directory from the Linux file system needs to be deleted.

rm

rm stands for remove, and it is used to remove files, directories, and links. By default, it does not remove directories.

When you use the '-i' argument, it prompts you for confirmation before each removal

To delete items recursively, employ the '-r' argument.

When the '-r' option is used with 'rm,' it has the capability to delete both nested files and directories

cat

It efficiently reads data from a specified file and provides the content as output, making it a valuable tool for examining file contents or processing data in various Linux and Unix-like operating systems.

less

In the world of Linux terminal pagers, the 'less' command stands out as a versatile and efficient tool for reading the contents of text files. Whether you're dealing with a small script or a large log file, 'less' allows you to navigate through the content one screen at a time, ensuring fast access without overwhelming your system's resources.

find

The 'find' command stands as one of Linux's most invaluable tools, particularly when confronted with the vast array of files and directories on a modern computer. True to its name, 'find' assists you in discovering items, and it goes beyond mere filenames.

syntax: find [directory] [type file/directory] [-arguments] [file name]

The 'find' command can employ wildcards (*) to look for files and directories that match specific patterns.

grep

The 'grep' filter is a Linux command that scans a file for a specific pattern of characters and reveals all lines that match that pattern. It's a powerful tool for searching and locating text within text files.

Use argument -i to ignore case.

ssh

The 'ssh' command establishes a secure, encrypted connection between two hosts, even over potentially insecure networks. This connection serves a multi-faceted purpose, including secure terminal access, file transfers, and the ability to tunnel various applications.

If public key authentication is enabled, the connection with the server will be established automatically. However, if it's not enabled, and the server allows password authentication, you'll need to provide a password to establish the connection

cp

The 'cp' command serves the purpose of duplicating single or multiple files and directories.

To copy files and directories recursively, utilize the '-r' argument. This feature proves invaluable when transferring files from one directory to another. Moreover, it extends its utility by supporting the use of wildcards, adding flexibility to the process.

mv

The Linux 'mv' command lets you shift a file or folder from one place to another. It's also handy for changing the name of a file or folder. If you just need to rename one file or folder, 'mv' is the way to go.

curl

The most basic way to use cURL is to show what's on a web page. cURL, short for 'Client URL,' is a command-line tool for moving data across different network protocols. You make it chat with a web server or application server by telling it a web address (URL) and explaining what data to send or get in return.

top

The 'top' command reveals the currently running Linux processes. It gives you an up-to-the-minute, live look at your system. Typically, it provides a snapshot of system stats and a list of processes or threads currently handled by the Linux kernel.

Using argument -u all the processes of specified user can be previewed.

clear

clear is a typical Unix OS command employed for wiping the slate clean on your terminal screen.

ping

The ping command is your go-to for testing server connections. It deploys ICMP (Internet Control Message Protocol) packets to chat with a target device. The response from the server is a vital indicator of whether the device is reachable or not.

whoami

It reveals the user currently active on the terminal.

which

The which command in Linux helps you find the executable file linked to a specified command by searching for it in the path environment variable.

man

In Linux, the 'man' command is your guidebook, showing you the user manual for any terminal command you want to use.

syntax: man [command]