This is an simple script for grep in txt files and zips

grep.sh

#!/bin/bash

if [ "$#" -ne 2 ]; then
    echo "Usage: $0 [PATH_TO_FOLDER] [SEARCH_STRING]"
    exit 1
fi

SRC_DIR="$1"
SEARCH_STRING="$2"
START_TIME=$SECONDS

grep -Ir "$SEARCH_STRING" "$SRC_DIR"

find "$SRC_DIR" -type f -name '*.zip' | while read -r zipfile
do
    unzip -p "$zipfile" | grep --with-filename --label="$zipfile" "$SEARCH_STRING"
done

ELAPSED_TIME=$(($SECONDS - $START_TIME))

echo "Total elapsed time: $ELAPSED_TIME seconds."