bash scripting

Monitoring system resources is vital for ensuring stable and efficient system performance. Bash scripts offer a lightweight and customizable way to track CPU usage, memory consumption, disk space, and more. This guide walks you through creating a Bash script to monitor these resources and explores advanced customizations for enhanced functionality. Here's a fundamental Bash script for monitoring CPU, memory, and disk usage: #!/bin/bash # Variables LOG_FILE="/var/log/system_monitor.

In Bash scripting, functions are used to group a set of commands that perform a specific task. Functions can be called multiple times within a script, making your code cleaner, reusable, and easier to maintain. A function in Bash can be defined using two main syntax formats: function function_name { # Commands to be executed } Syntax 2: Without the function keyword (more common) function_name() { # Commands to be executed } The second format is the more common one and is often preferred for simplicity. greet() { echo "Hello, $1!" # $1 is the first argument passed to the function } 2. Calling a Function Once a function is defined, you can call it by simply using its name, followed by any arguments if needed.

Loops in Bash are essential for automating repetitive tasks, iterating through lists, or executing commands multiple times. Bash provides three primary types of loops: for, while, and until. Each has its own use cases and syntax. The for loop in Bash is used to iterate over a list of items (such as numbers, files, or strings) and execute a block of code for each item. for variable in list do # Commands to execute done Example 1: Iterating Over a List of Items for fruit in apple banana cherry do echo "I love $fruit" done Output: I love apple I love banana I love cherry for i in {1..

Bash scripting combined with cron jobs offers a powerful way to automate repetitive tasks on Linux systems. Cron is a time-based job scheduler that allows you to run scripts and commands at scheduled intervals, making it ideal for regular maintenance, backups, and other automated tasks. This guide will introduce you to cron jobs and demonstrate how you can use Bash scripts for task automation. 1. What are Cron Jobs? A cron job is a scheduled task that runs automatically at specified intervals. The cron daemon (crond) is responsible for executing scheduled jobs on Linux systems. These jobs are defined in a configuration file called the crontab (cron table). Cron jobs can be set up to run: Daily, weekly, or monthly At a specific time (e.g.

Bash scripting is a way to automate tasks in Linux using Bash (Bourne Again Shell), a widely used shell on Unix-like systems. This guide introduces the basics of Bash scripting, enabling you to create and execute your first scripts. 1. What is a Bash Script? A Bash script is a plain text file containing a series of commands executed sequentially by the Bash shell. It’s useful for automating repetitive tasks, system administration, and process management. A Bash script is a text file. It typically has a .sh extension (e.g., myscript.sh), though this isn’t mandatory. The Shebang Line: The first line of a Bash script starts with a shebang (#!), which tells the system which interpreter to use. Example: #!/bin/bash 3.