#!/bin/bash

exitCode=0

for user in $(getent passwd | grep -ve root -e www-data | cut -d: -f1); do
  openFiles=$(lsof -n -u "$user" | wc -l)
  if [[ $openFiles -ge 3200 ]]; then
    echo "CRITICAL: $user has more than 3200 files opened!"
    exitCode=2
  elif [[ $openFiles -ge 2000 ]]; then
    echo "WARNING: $user has more than 2000 files opened!"
    if [[ $exitCode -ne 2 ]]; then
      exitCode=1
    fi
  fi
done

if [[ $exitCode -eq 1 || $exitCode -eq 2 ]]; then
  exit $exitCode
else
  echo "OK"
  exit 0
fi