#!/bin/bash

# Check if a file was provided
if [ "$#" -ne 1 ]; then
    echo "Usage: $0 [file]"
    exit 1
fi

# File to be processed
FILE="$1"

# Check if the file exists
if [ ! -f "$FILE" ]; then
    echo "Error: File not found."
    exit 1
fi

# Create a backup of the original file
cp "$FILE" "$FILE.bak"

# Replace special characters within <description> tags using sed
sed -i '/^<description>/,/<\/description>/ s/&/\&amp;/g; s/</\&lt;/g; s/>/\&gt;/g; s/"/\&quot;/g; s/'"'"'/\&apos;/g' "$FILE"

echo "Processing complete. Original file backed up as $FILE.bak"