Downloading Files and Extracting Archives with Bash

#!/bin/bash

# Configuration
DOWNLOAD_URL="https://example.com/archive.tar.gz" # URL of the file to download
# DOWNLOAD_URL="https://github.com/someuser/somerepo/archive/refs/heads/main.zip"
OUTPUT_DIR="./downloads" # Directory to save the downloaded file and extracted contents

# Create the output directory if it doesn't exist
mkdir -p "$OUTPUT_DIR" || { echo "Error: Could not create output directory!"; exit 1; }

# Extract filename from URL
FILENAME=$(basename "$DOWNLOAD_URL")
DOWNLOAD_PATH="$OUTPUT_DIR/$FILENAME"

echo "Downloading '$FILENAME' from '$DOWNLOAD_URL' to '$DOWNLOAD_PATH'..."

# Download the file using curl
# -L: Follow redirects
# -O: Write output to a local file named like the remote file (cannot be used with -o)
# -f: Fail silently (no output at all) on HTTP errors
# Using -o to specify output path explicitly
curl -Lfo "$DOWNLOAD_PATH" "$DOWNLOAD_URL" || { echo "Download failed!"; exit 1; }

echo "Download complete. Checking file type for extraction..."

# Determine file type and extract
case "$FILENAME" in
    *.tar.gz|*.tgz)
        echo "Extracting .tar.gz archive..."
        tar -xzf "$DOWNLOAD_PATH" -C "$OUTPUT_DIR" || { echo "Extraction failed!"; exit 1; }
        ;;
    *.tar.bz2|*.tbz)
        echo "Extracting .tar.bz2 archive..."
        tar -xjf "$DOWNLOAD_PATH" -C "$OUTPUT_DIR" || { echo "Extraction failed!"; exit 1; }
        ;;
    *.zip)
        echo "Extracting .zip archive..."
        unzip "$DOWNLOAD_PATH" -d "$OUTPUT_DIR" || { echo "Extraction failed!"; exit 1; }
        ;;
    *)
        echo "Unknown archive type or no extraction needed for '$FILENAME'."
        ;;
esac

# Optional: Clean up the downloaded archive file
# rm "$DOWNLOAD_PATH"
# echo "Removed downloaded archive: $DOWNLOAD_PATH"

echo "Script finished."