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#!/bin/bash

LOG_FILE="/tmp/tmp.log"
USER_NAME="admin"
MONITOR_DIR="/opt/antivirus"

SECRET1="secret.txt"
SECRET2="secret2.txt"
SECRET3="secret3.txt"

MONITOR="monitor.txt"
MAILTO="admin@domain.ru"
MONITOR_FILE=("$MONITOR_DIR/$SECRET1" "$MONITOR_DIR/$SECRET2" "$MONITOR_DIR/$SECRET3")

case "$1" in

    -start)
    sh follow.sh -check &
    sh follow.sh -mail &

    ;;

    -check)

      inotifywait --recursive --monitor --format "%e %w%f" \
      --event open "${MONITOR_FILE[@]}" \
      | while read changed; do
          echo "$(date "+%d.%m.%H.%M.%S")-$changed" 2>&1 | tee "$LOG_FILE" >> $MONITOR
      done

      ;;

    -mail)

      CS=$(md5sum "$LOG_FILE" | awk '{print $1}')
      while true; do
      N_CS=$(md5sum "$LOG_FILE" | awk '{print $1}')
        if [ "$CS" != "$N_CS" ]; then
            echo "$(cat $MONITOR | tail -n1 | awk  -F " " '{print $2}')" | mailx -s "Файл прочитан! " $MAILTO
        fi
      CS="$N_CS"
      sleep 5

      done

      ;;

      -stop )
    xcmd="$(mktemp)"
    echo "$(ps aux | grep -w follow.sh | awk -F" " '{print $2}')" > "$xcmd"
    while read -r line; do
      kill -9 "$line"
    done < "$xcmd"
      rm -f "$xcmd"
    ;;

  * )
  echo "Usage: $0

    follow.sh { -start, -stop }
  "
    ;;

esac
exit 1
```

echo "$(cat $MONITOR | tail -n1 | awk  -F " " '{print $2}')" | mailx -s "Файл прочитан! " $MAILTO

echo "$(cat $MONITOR | tail -n1 | awk  -F " " '{print $2}')" && echo "$(lsof | grep $MONITOR_DIR)" | mailx -s "Файл прочитан пользователями!" $MAILTO