#!/usr/bin/env bash

usage() {
  echo "Usage: $(basename $0) <file>"
}

if [ "$#" -ne 1 ]; then
  usage
  exit 1
fi

ssh vps "tail -n 0 -f $1" | stdbuf -o0 grep error | while IFS= read -r line
do
  title=$(basename $1)
  d=$(date "+%Y/%m/%d %H:%M:%S %Z")
  echo "$d $line"
  body="$d\n$line"
  notify-send "$title" "$body"
done