Something

#!/bin/bashMAXFILES="$1"FILENUM="1"PARTNUM="1"DIRNAME="Part$(printf "%.2d" "$PARTNUM")"[ ! -d "$DIRNAME" ] && mkdir -p "$DIRNAME"for file in *; do  if [ "$FILENUM" -gt "$MAXFILES" ]; then    FILENUM="1"    let "PARTNUM++"    DIRNAME="Part$(printf "%.2d" "$PARTNUM")"    [ ! -d "$DIRNAME" ] && mkdir -p "$DIRNAME"  fi  mv "$file" "$DIRNAME"  let "FILENUM++"done