Introduction

Continuing my DevOps journey, today I went deeper into Bash scripting, focusing on advanced concepts like functions, automation, and task scheduling. Mastering these skills is essential for automating system administration tasks, managing servers, and improving workflow efficiency.

What I Learned Today?

1️⃣ Functions in Bash

Functions help in code reusability and modular scripting. I practiced:

Defining functions:

  my_function() {
      echo "Hello, this is a function!"
  }
  my_function

Passing arguments to functions:

  greet_user() {
      echo "Hello, $1! Welcome to Bash scripting."
  }
  greet_user "Pratham"

Using return values:

  sum() {
      result=$(( $1 + $2 ))
      echo $result
  }
  total=$(sum 5 10)
  echo "Total: $total"

2️⃣ Process Management & Background Jobs

Understanding how to manage processes is essential for handling system performance efficiently. I practiced:

Running scripts in the background:
```
  ./script.sh &
```
Checking running processes:
```
  ps aux | grep script.sh
```
Killing a process:
```
  kill <process_id>
```

3️⃣ Log Management & Debugging

Debugging Bash scripts is crucial to avoid unexpected issues. I explored:

Debugging with set -x:

  #!/bin/bash
  set -x
  echo "Debugging mode enabled!"

Using trap to handle errors gracefully:

  trap 'echo "An error occurred. Exiting..."; exit 1' ERR

Log rotation for system logs:
```
  logrotate /etc/logrotate.conf
```

Challenges I Faced

Understanding function return values in Bash.
Debugging unexpected script failures.

What’s Next?

Tomorrow, I will focus on:

Shell scripting for system administration
Working with APIs using curl and wget

Bash scripting is an essential skill for DevOps engineers, and today’s practice strengthened my understanding of automation, process management, and debugging techniques. The journey continues!

3/n

#DevOps #BashScripting #Automation #100DaysOfDevOps

Advanced Bash Scripting