md5_cp/cp_sh

#!/bin/bash
# @autor 6543@obermui.de
# @date 2019-09-11
# @version 0.3

function free_disk() {
  df "$1" | tail -n1 | sed -r -e "s/[\t\ ]+/ /g" | cut -d ' ' -f 4
}

md5="2cp.md5"
aim="/mnt/export/transport"
source="/data/Filme"

## prepare
aim="$(echo $aim | sed 's/\/$//g')"
source="$(echo $source | sed 's/\/$//g')"

md5_tmp=`mktemp`
cat "$md5" > "$md5_tmp"
sed -i '/^$/d' "$md5_tmp"
sed -i "s/${source//'/'/'\/'}//g" "$md5_tmp"  #from absolut to relative paths

freenow=0


## start prosessing
cat "$md5_tmp" | while read line; do
  file="$(echo $line | cut -c 33- | sed -r -e "s/^[\ ]//g")"
  file_orig="${source}${file}"
  file_size=$(du "$file_orig" | cut -f 1)
  file_md5=$(echo $line | cut -c -32)
  file_aim="${aim}${file}"
  file_aim_dir=$(echo $file_aim | rev | cut -d '/' -f 2- | rev)

  [ "$file_orig" == "$file_aim" ] && { echo Script ERROR; exit 255; }

  freenow=$(free_disk "$aim")
  #add puffer
  freenow=$((freenow-10240))

  if [ -f "$file_orig" ]; then

    if [ "$freenow" -ge "$file_size" ]; then

      mkdir -p "$file_aim_dir"
      [ -f "$file_aim" ] && rm "$file_aim"

      file_md5_new=$(cat "$file_orig" | tee "$file_aim" | md5sum | cut -c -32)

      if [ "${file_md5_new}" == "${file_md5}" ]; then
        echo "$file_md5  $file_aim" | tee -a "${md5}.sucess-log"
        sed -i "/$file_md5/d" "$md5"
      else
        echo "Error: Hash mismatch: \"NEW:${file_md5_new} OLD:${file_md5}\" $file_aim" | tee -a "${md5}.error-log"
        sed -i "/$file_md5/d" "$md5"
      fi

    else
      echo "To Big: $file_md5  $file_orig" | tee -a "${md5}.error-log"
    fi

  else
    echo "Error: Not Exist: $file_orig" | tee -a "${md5}.error-log"
    sed -i "/$file_md5/d" "$md5"
  fi
done

rm "$md5_tmp"