#!/bin/bash# exctute# ./mod.sh file_type input_folder output_folder# ./mod.sh *.txt /tmp /data/# paramater count if [ ! $# -eq 3 ]; then  echo "[ERROR] error paramater."  exitfi# file typefile_type="${1}"# input foloderif [ -d "${2}" ]; then   folder="${2}"else  echo "[ERROR] input folder is not exsit."  exit fi# output folderif [ -d "${3}" ]; then  output="${3}"else  echo "[ERROR] output folder is not exsit."  exitfi# search filefind ${folder} -name "${file_type}" | while read filename ; do  # file type  file_type=`echo ${filename##*.}`  # file size  file_size=`stat "${filename}" | sed -n '2,1p' | awk '{print $2}' `  # file modify time  file_modify=`stat "${filename}" | sed -n '6,1p' | awk '{print $2, $3}' | sed -e 's/[-: ]//g' `  # output folder   path="${output}/${file_modify:0:6}"  if [ ! -d "${path}" ]; then    mkdir -p ${path}    echo "folder(${path}) is created . "  fi  # new file full name   new_file_name=`echo ${path}/${file_modify}_[${file_size}].${file_type}`  if [ ! -f "${new_file_name}" ]; then    mv "${filename}" "${new_file_name}"  else    echo "file(${new_file_name}) is exsit, can not be removed. "  fidoneecho "finished !"exit