util

Some simple scripts. For fun / personal use.

Scripts

Image Conversion Scripts

Simple bash scripts for batch image format conversion:

• jpg_png.sh - Convert JPG files to PNG format
• png_jpg.sh - Convert PNG files to JPG format
• webp_png.sh - Convert WebP files to PNG format

Usage: ./script_name.sh file1.jpg file2.jpg file3.jpg

File Management

• rename.sh - Batch rename files with a common prefix
  • Prompts for prefix and renames all provided files
  • Usage: ./rename.sh file1.txt file2.txt file3.txt

Network Analysis

• pcap_activity_analyser.py - Analyse PCAP files for network activity patterns
  • Groups PCAP files by 24-hour periods based on timestamps in filenames
  • Reports on network activity patterns and file sizes
  • Can filter for files with unencrypted traffic (requires tshark)
  • Supports recursive directory scanning and ZIP creation
  • Usage: python3 pcap_activity_analyser.py [options]

DNS Management

• upduck.sh - Update Duck DNS domain IP addresses

Upduck

A simple script to update the IP address that a Duck DNS domain name resolves to.

Available environment variables*

• $DUCKDNS_DOMAIN: The domain you want to update
• $DUCKDNS_TOKEN: The token to use to authenticate the request
• $DUCKDNS_IP: (Optional) The IP address that the provided domain should resolve to — Duck DNS will detect and use the source IP otherwise

*All other Duck DNS API options are optional; I'm aiming for feature parity in the future.

NOTE: command line options override environment variables.

Error codes:

1. Invalid arguments
2. Failure to find wget on the system
3. No domain provided, by command option or environment variable
4. No token provided, by command option or environment variable
5. Duck DNS returned a 'normal' bad response (check inputs)
6. Duck DNS returned an unexpected error / response

Thank you!

Thanks to the folks at Duck DNS for offering such a great service!