批处理文件逻辑可根据文件名中的日期删除文件 [英] Batch file logic to delete files based on date in filename

问题描述

我现在对.bat文件有一个看似无害的要求，我是第一次处理批处理代码...找到了一个页面

I now have a seemingly innocuous requirement to be put in a .bat file ,I am dealing with Batch code for the first time ...found a page here that deals with something similar but it takes the modified date as reference.

在特定的文件夹X中，通过解析文件名来删除所有早于N天的文件. 文件名格式为Name_YYYYMMDD.log

In a particular folder X , Delete all files older than N days by parsing through their file name. where file name format is Name_YYYYMMDD.log

但请注意: 1.不想将上次修改日期作为参考(其他程序/应用可能已访问/修改了日志) 2.没有安装其他实用程序的权限.

But note : 1. Do not want the last modified date as reference (log might have been accessed/modified by other programs/apps) 2.No permission to install other utilities.

• FORFILES命令在此工作中效果很好(但唯一的缺点是它以修改日期"为参考)
• 将Aacini的以下脚本调整为规范后，可以正常工作.
• 由于其他条件使整个场景更加复杂，我们决定放弃批处理，而在Powershell或AutoIT中进行处理.

谢谢！.

推荐答案

下面的批处理文件将文件日期转换为朱利安天数，即连续的天数，并使用它来知道每个天数.参数中给出了删除文件的天数.

The Batch file below convert file date to Julian Day Number, that is a sequential number of days, and use it to know how many days old is each one. The number of days to delete files is given in the parameter.

@echo off
setlocal EnableDelayedExpansion

rem Get Julian Day Number of today's date
rem The assumed format is MM/DD/YYYY, change C-A-B order in accordance with your locale
for /F "tokens=1-3 delims=/" %%a in ("%date%") do (
   set todayDate=%%c%%a%%b
)
call :DateToJDN %todayDate% todayJDN=

for /F "tokens=1-3 delims=_." %%a in ('dir /B /A-D *.*') do (
   call :DateToJDN %%b fileJDN=
   set /A daysOld=todayJDN - fileJDN
   if !daysOld! gtr %1 (
      echo File "%%a_%%b.%%c" is !daysOld! days old
   )
)
goto :EOF

:DateToJDN yyyymmdd jdn=
set yyyymmdd=%1
set /A yyyy=%yyyymmdd:~0,4%, mm=1%yyyymmdd:~4,2% %% 100, dd=1%yyyymmdd:~6% %% 100
set /A a=(mm-14)/12, %2=(1461*(yyyy+4800+a))/4+(367*(mm-2-12*a))/12-(3*((yyyy+4900+a)/100))/4+dd-32075
exit /B

测试此程序，并将echo File "%%a_%%b.%%c" ...命令更改为所需的del "%%a_%%b.%%c".

Test this program and change the echo File "%%a_%%b.%%c" ... command by the desired del "%%a_%%b.%%c" one.

参考: http://www.hermetic.ch/cal_stud/jdn.htm#补偿

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