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In work, I often encounter customers asking to automatically back up files. Usually, I use software to complete file backups. General databases can usually perform backups by themselves or be done by DBAs, so there are relatively few batch processing issues.

But now there is a project where all files (except databases) need to be backed up regularly, and according to time, only a specified number (such as 5 copies) is retained. Such backups are easy to handle, but deletion is difficult. I sincerely ask experts to give a complete solution. I am very grateful. Maybe others will use it in the future, which is beneficial to both others and myself.

Thanks

This is very similar to the automatic backup of the Windows registry

"Also, it deletes according to time, keeping only the agreed number". Based on what time? The file creation time? The file's last modification time? Or the time a few days ago from the current time?

The time when the file was created. The backup file is not modified, just to ensure that it can be restored and used later.

@echo off

    set strTime=2006-10-17

    set "command=dir /a-d /od /t:c ^| findstr /irc:"^%%strTime%%""

    for /f "tokens=3,*" %%i in ('%command%') do echo %%j

pause

wmic datafile where "InstallDate>='20061018000000.000000+480' and path='\\documents and settings\\xxx\桌面\\'" get caption

1. dir

@echo off

    set strTime=2006-10-17

    set "command=dir /a-d /od /t:c ^| findstr /irc:"^%%strTime%%""

    for /f "tokens=3,*" %%i in ('%command%') do echo %%j

pause

To delete, just change echo to del. If dealing with multiple directories, you can consider using the form call :label parameter, which makes the code easier to organize and modify.
2. wmic

wmic datafile where "InstallDate>='20061018000000.000000+480' and path='\\documents and settings\\xxx\桌面\\'" get caption

Note: If you want to delete directly without displaying, you can change the subsequent get caption to call delete /NOINTERACTIVE. Without /NOINTERACTIVE, it is in interactive mode and requires confirmation.

Learning, there are really many experts ^0^

Maybe it's my expression that's problematic. Here, the time can't be hard-coded. I only dynamically ensure that the specified number of files in the backup folder are the most recent backups. For example, if there are 5 backups, when a new one is added recently, the earliest one among these 5 is automatically deleted. It's a process of constantly updating.

And it's similar to the following post

lilankui
Newcomer

Score 6
Posts 1
Registered 2006-9-5
From Jiangxi
Status Offline 『L楼 owner』: How to use batch processing to delete files older than 7 days

@echo
Rem Get the date 7 days ago, and get it into variable nowdate
echo wscript.echo dateadd("d",-6,date) >%tmp%\tmp.vbs
for /f "tokens=1,2,3* delims=-" %%i in ('cscript /nologo %tmp%\tmp.vbs') do set y=%%i
for /f "tokens=1,2,3* delims=-" %%i in ('cscript /nologo %tmp%\tmp.vbs') do set m=%%j
for /f "tokens=1,2,3* delims=-" %%i in ('cscript /nologo %tmp%\tmp.vbs') do set d=%%k
if %m% LSS 9 set m=0%m%
if %d% LSS 9 set d=0%d%
set nowdate=%y%-%m%-%d%
I want to know how to interpret these lines "for /f "tokens=1,2,3* delims=-" %%i in ('cscript /nologo %tmp%\tmp.vbs') do set d=%%k", which expert can tell me

『2nd floor』: There are too many things to consider for date operations, at least with batch processing. Back to LZ, he combines VBS script and batch processing to complete it. The code hasn't been tested. I'm going to write a batch processing about this. There are really too many things to consider, hehe................

Last edited by fangcheng79 on 2006-10-19 at 22:03 ]

A feasible method has come out. Do we really have to post the complete code?

dir /a-d /od /t:c /b can list the files in the current directory from the most recent to the oldest by time. Put it inside for, use for /f "delims=" %%i in ('%command%') do set "file=%%i"
Then just del %file% is done.
p.s: dir also supports dir abcd*.xxx

I'm a newbie. Please, moderator, spend a little time posting the complete program. Thanks

@echo off

echo wscript.echo dateadd("d",-6,date)>tmp.vbs

for /f "tokens=1,2,3* delims=-" %%i in ('cscript /nologo tmp.vbs') do set/a a=%%i*365+%%j*12+%%k+1300

for /f "tokens=1,2,3,5* delims=- " %%a in ('dir/a-d^|findstr "199 200"') do (set/a b=%%a*365+1%%b*12+1%%c

if !b! lss %a% del  "%%e")

```@echo off
echo wscript.echo dateadd("d",-6,date)>tmp.vbs
for /f "tokens=1,2,3* delims=-" %%i in ('cscript /nologo tmp.vbs') do set/a a=%%i*365+%%j*12+%%k+1300
for /f "tokens=1,2,3,5* delims=- " %%a in ('dir/a-d^|findstr "199 200"') do (set/a b=%%a*365+1%%b*12+1%%c
if !b! lss %a% del "%%e")
```

The moderator is super powerful~ Appreciate~ :)))

Originally, set /a a=2006*365+11*12+19+1300... All convert years/months/days into pure numbers,
and then compare with pure numbers~ :)))

Learning... Another question, where should this processing file be placed, inside the backup file or outside? If placed inside, will it be deleted?

@echo off
echo wscript.echo dateadd("d",-6,date)>tmp.vbs
for /f "tokens=1,2,3* delims=-" %%i in ('cscript /nologo tmp.vbs') do set/a a=%%i*365+%%j*12+%%k+1300
for /f "tokens=1,2,3,5* delims=- " %%a in ('dir/a-d^|findstr "199 200"') do (set/a b=%%a*365+1%%b*12+1%%c
if !b! lss %a% del "%%e")

Who can explain this code?

Last edited by linqlou on 2006-11-25 at 08:09 PM ]

@echo off

echo wscript.echo dateadd("d",-6,date)>tmp.vbs

for /f "tokens=1,2,3* delims=-" %%i in ('cscript /nologo tmp.vbs') do set/a a=%%i*366+%%j*31+%%k+3200

for /f "tokens=1,2,3,5* delims=- " %%a in ('dir/a-d^|findstr "199 200"') do (set/a b=%%a*366+1%%b*31+1%%c

if !b! lss %a% if not "%~nx0"=="%%e" del "%%e")

The following will not delete itself:

@echo off

echo wscript.echo dateadd("d",-6,date)>tmp.vbs

for /f "tokens=1,2,3* delims=-" %%i in ('cscript /nologo tmp.vbs') do set/a a=%%i*366+%%j*31+%%k+3200

for /f "tokens=1,2,3,5* delims=- " %%a in ('dir/a-d^|findstr "199 200"') do (set/a b=%%a*366+1%%b*31+1%%c

if !b! lss %a% if not "%~nx0"=="%%e" del "%%e")

The moderator is awesome! When I am unrestricted, I will definitely give you extra points!