A bash script to replace icons in Linux

    
sudo ./icons.sh /home/USERNAME/icon.svg

  

    
#!/bin/bash

# Define the base directory where icons are located
BASE_DIR="/usr/share/icons/hicolor"

# Ensure the script is run as root to modify files in /usr/share/icons/hicolor
if [ "$(id -u)" -ne 0 ]; then
    echo "This script must be run with root privileges to access the icons folder."
    exit 1
fi

# Check if Inkscape is installed
if ! command -v inkscape &> /dev/null; then
    echo "Inkscape is not installed. Please install it and try again. (sudo apt install inkscape)"
    exit 1
fi

# Input SVG file filepath
INPUT_SVG="$1"
if [ -z "$INPUT_SVG" ]; then
    echo "Usage: $0 /path/to/input.svg"
    exit 1
fi

# Validate that the input SVG file exists
if [ ! -f "$INPUT_SVG" ]; then
    echo "Input SVG file does not exist."
    exit 1
fi

# Loop through all resolution folders (resolutions like 16x16, 32x32, etc.) in the /usr/share/icons/hicolor folder
for resolution_dir in "$BASE_DIR"/*x*; do
    # Check if the resolution folder contains an 'apps' subfolder
    if [ -d "$resolution_dir/apps" ]; then
        echo "Found apps folder in $resolution_dir"

        # Extract the resolution size (e.g., 16x16)
        resolution=$(basename "$resolution_dir")

        # Get the name of the input SVG file (without the .svg extension)
        base_name=$(basename "$INPUT_SVG" .svg)

        # Define the target PNG file path in the current resolution folder
        target_png="$resolution_dir/apps/$base_name.png"

        # Check if the resolution folder already contains a PNG file to replace
        if [ -f "$target_png" ]; then
            echo "Found existing $target_png. Replacing it."

            # Use Inkscape to convert the SVG to PNG at the correct resolution
            inkscape "$INPUT_SVG" --export-type=png --export-filename="$target_png" --export-width="${resolution%x*}" --export-height="${resolution#*x}"

            # Confirm creation
            if [ -f "$target_png" ]; then
                echo "Successfully created $target_png"
            else
                echo "Failed to create $target_png"
            fi
        else
            echo "No existing $target_png found. Skipping this resolution."
        fi
    else
        echo "No 'apps' folder found in $resolution_dir. Skipping."
    fi
done

echo "Icon update process complete!"