ImageMagick bash script for creating a favicon.ico embedding multiple version of a starting PNG image

png2favicon.sh

#!/bin/bash

# Check if ImageMagick is installed
if ! command -v magick &>/dev/null; then
    echo "Error: ImageMagick not installed."
    exit 1
fi

# Check if the input file is provided
if [ -z "$1" ]; then
    echo "Usage: $0 <path_to_image>"
    echo "Error: specify a PNG input image."
    exit 1
fi

# Check if the input file exists
if [ ! -f "$1" ]; then
    echo "Error: file '$1' does not exits."
    exit 1
fi

INPUT_FILE="$1"
OUTPUT_DIR="tmp_fav"

mkdir -p "$OUTPUT_DIR"
cp "$INPUT_FILE" "$OUTPUT_DIR/favicon.png"
cd "$OUTPUT_DIR" || exit

# Resize images
echo "Resizing..."
magick favicon.png -resize 16x16 favicon-16x16.png
magick favicon.png -resize 32x32 favicon-32x32.png
magick favicon.png -resize 48x48 favicon-48x48.png
magick favicon.png -resize 64x64 favicon-64x64.png
magick favicon.png -resize 180x180 favicon-180x180.png

# Create the favicon.ico file
echo "Creating favicon.ico..."
magick favicon-16x16.png favicon-32x32.png favicon-48x48.png favicon-64x64.png favicon-180x180.png favicon.ico

cp favicon.ico ..
cd ..

# Clean up: remove the temporary directory
echo "Cleanup..."
rm -rf "$OUTPUT_DIR"

echo "Favicon.ico created."