#!/bin/bash

# set charset to avoid problems
export LANG=en_US.UTF-8
export LANGUAGE=en_US:en
export LC_CTYPE=en_US.UTF-8

# config
base_dir=/home/dp/all_dirs
sum_dir=$base_dir/_md5_check/sums
log_dir=$base_dir/_md5_check/$(date +%Y%m%d)

# functions
function check_md5 {
export LANG=en_US.UTF-8
export LANGUAGE=en_US:en
export LC_CTYPE=en_US.UTF-8

  my_stdout=$log_dir/${1:0: -4}_stdout.txt
  my_stderr=$log_dir/${1:0: -4}_stderr.txt
  my_time=$log_dir/${1:0: -4}_time.txt
  my_analyse=$log_dir/${1:0: -4}_analysis.txt

  cd $base_dir

  (time md5sum -c $sum_dir/${1} > $my_stdout 2> $my_stderr) 2> $my_time
  grep -v OK $my_stdout > $my_analyse
}

# main program
mkdir $log_dir
cd $sum_dir

for i in a0[1-6]*.md5; do
  check_md5 $i &
done

wait

for i in a0[7-9]*.md5 a1[0-2]*.md5; do
  check_md5 $i &
done

wait

for i in a1[3-7]*.md5; do
  check_md5 $i &
done