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BASH Snippets.

Define Global Environment Variables and Aliases

Create a Bash script to set up common environment variables and useful command aliases for all new shell sessions, enhancing developer productivity and consistency.

Robust Error Handling and Logging for Bash Scripts

Learn to implement robust error handling, trap signals, and redirect all script output to a log file, ensuring critical operations are reliably monitored and debugged.

Parsing Command Line Arguments in Bash with `getopts`

Learn to efficiently parse short command-line options and their arguments using `getopts` in Bash, making your scripts more flexible and user-friendly.

Check Open Port and Identify Process in Bash

Discover how to use Bash to check if a specific network port is in use and identify the process (PID and name) currently listening on it, useful for debugging port conflicts.

Monitor Disk Usage and Send Email Alerts in Bash

Implement a Bash script to monitor disk space usage on your server and send an email alert when a specified threshold is exceeded, preventing critical storage issues.

Automating Nginx/Apache Configuration Reload

Learn to automate web server configuration reloads with a bash script. This snippet safely tests Nginx or Apache configs and reloads services, ideal for deployments.

Deploy Static Files with Rsync over SSH

Automate static website deployments with this bash script using `rsync` over SSH. It efficiently transfers and synchronizes files to a remote server.

Automate Directory Backup with Timestamp

Learn to create a robust Bash script for automating directory backups, appending a timestamp to each archive for easy versioning and recovery.

Check and Restart System Service with Bash

Implement a Bash script to monitor a critical system service like Nginx or MySQL, automatically restarting it if it's not running to maintain uptime.

Automate Deletion of Old Files

Learn to write a Bash script that efficiently finds and deletes files older than a specified number of days, perfect for log rotation or temporary file cleanup.

Automate File Backup with Timestamp and Compression

Create a robust Bash script to automatically backup specified files or directories, adding a timestamp to the archive name and compressing it using `tar` and `gzip` for storage.

Check if Command Exists and Install if Missing

Write a Bash script to verify the presence of a required command (e.g., `jq`, `curl`) and provide instructions or attempt installation using common package managers like `apt`, `yum`, or `brew`.