What is Kernel ?
The kernel is the most important part of the operating system. It is the primary interface between the hardware and the processes of a computer. The kernel connects these two in order to adjust resources as effectively as possible.
Purposes of the Kernel
Determines which process is the next process on the central process unit (CPU), when, and how long
Monitors how much memory is being used to store what and where
Serves as an interpreter between the hardware and processes
Receives requests for service from the processes via system calls
Shell
In a computer operating system, the shell and the kernel are two important components that work together to enable the user to interact with the system.
The shell is a command-line interface that allows the user to enter commands to interact with the operating system. It acts as an intermediary between the user and the kernel, interpreting commands entered by the user and translating them into instructions that the kernel can execute. The shell also provides various features like command history, tab completion, and scripting capabilities to make it easier for the user to work with the system.
Shell Scripting for DevOps
Shell scripting is a form of programming that allows you to automate tasks by creating scripts that the shell interprets and executes. In Linux, the most common shell for scripting is Bash, and that's what we'll focus on in this guide.
Let us know go through 3 simple shell scripts
To execute the scripts you would need to set execute permissions for the shell script file
chmod 777 file
The first one prints an output that is provided in script
The second one prints an output taking in the value provided by the user when prompted by script.
The last one is a simple script that prints output based on argument provided by user on execution.
💡 Key Takeaways:
The Kernel is the beating heart of Linux, managing resources and facilitating communication between hardware and software.
The Shell provides a user interface to interact with the Kernel through commands, enabling you to harness the full potential of your system.
Shell scripting is your secret weapon for automating tasks, increasing efficiency, and becoming a true Linux maestro.
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