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BASH Snippets.

Parse and Extract Data from JSON API Responses with curl and jq

Leverage `curl` to fetch JSON data from a web API and use `jq` to efficiently parse and extract specific fields for command-line scripting and automation.

Monitor Disk Space and Send Email Alerts

Implement a critical server monitoring script that checks disk space usage and dispatches email alerts to administrators when thresholds are surpassed.

Automate Nginx Configuration Reload on Changes

Automatically validate and reload your Nginx configuration files when changes are detected, ensuring your web server always runs with the latest settings.

Robust Command-Line Argument Parsing with getopts

Learn how to parse command-line options and arguments robustly in Bash scripts using the built-in `getopts` command for better script usability and flexibility, handling flags and values.

Securely Download and Verify File Integrity with Bash

Ensure the integrity and authenticity of downloaded files in Bash by fetching them securely with `curl` over HTTPS and verifying their SHA256 checksum against a known, trusted value.

Implement Retry with Exponential Backoff in Bash

Build a robust retry mechanism with exponential backoff in Bash scripts, ideal for handling transient network failures or unavailable services when executing critical commands or API calls.

Manage Background Processes and Log Output in Bash

Learn to run long-running commands in the background of your Bash scripts, effectively track their Process ID (PID), and redirect their standard output and error streams to specific log files.

Create a Command-Line Progress Spinner in Bash

Enhance the user experience of long-running Bash scripts by implementing an animated progress spinner directly in the terminal, providing visual feedback during operations.

Automating MySQL Database Backup and Compression

Learn to create a robust Bash script for automating MySQL database backups, compressing them, and storing them with a timestamp for easy recovery.

Basic Web Service Availability Check

Implement a simple Bash script to check the availability of a web service by making a GET request and verifying the HTTP status code (e.g., 200 OK).

Deploying Static Website Files with Rsync

Streamline your static website deployments using a Bash script with `rsync` to efficiently synchronize local files to a remote server over SSH.

Automatically Purging Old Log Files

Create a Bash script to automatically identify and delete log files older than a specified number of days, helping manage disk space on web servers.