#!/bin/bash

if [ "$#" -ne 2 ]; then
echo "Error: Exactly 2 arguments are required."
echo "Usage: $0 <filename> <directory>"
exit 1
fi

FILE=$1
DIRECTORY=$2

if [ ! -f "$FILE" ]; then
echo "Error: File '$FILE' does not exist."
exit 1
fi

if [ ! -d "$DIRECTORY" ]; then
mkdir -p "$DIRECTORY"
fi

OUTPUT_FILE="$DIRECTORY/special.txt"

grep "special" "$FILE" >> "$OUTPUT_FILE"

echo "Lines containing 'special' have been saved to '$OUTPUT_FILE'."