根据文件的修改时间来分类文件

#!/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