windows 如何使用 forfile（或类似的）删除超过 n 天的文件，但始终保留最近的 n
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How to use forfiles (or similar) to delete files older than n days, but always leaving most recent n
提问by Aidan Whitehall
(Using Windows 2000 and 2003 Server)
（使用 Windows 2000 和 2003 服务器）
We use forfiles.exe to delete backup .zip files older than n days, and it works great (command is a bit like below)
我们使用 forfiles.exe 删除超过 n 天的备份 .zip 文件，效果很好（命令有点像下面）
forfiles -p"C:\Backup" -m"*.zip" -c"cmd /c if @ISDIR==FALSE del \"@PATH\@FILE\"" -d-5
If a .zip file fails to be created, I'd like to ensure that we don't end up with 0 .zip files in the backup after 5 days. Therefore, the command needs to be:
如果无法创建 .zip 文件，我想确保 5 天后备份中不会出现 0 个 .zip 文件。因此，命令需要是：
"delete anything older than 5 days, but ALWAYS keep the most recent 5 files, EVEN if they themselves are older than 5 days"
“删除任何早于 5 天的文件，但始终保留最近的 5 个文件，即使它们本身早于 5 天”
We can use forfiles.exe or another solution (although anything that is a slick one-liner is ALWAYS preferable to a script file).
我们可以使用 forfiles.exe 或其他解决方案（尽管任何光滑的单行代码总是比脚本文件更可取）。
Thanks!
谢谢！
回答by MatsT
FOR /F "skip=5 delims=" %%G IN ('dir /b /O-D /A-D') DO del "%%G"
Will delete all files except the 5 newest ones. I couldn't find a one-liner to keep all files newer than 5 days so for that you might have to use some more complicated logic.
将删除除 5 个最新文件之外的所有文件。我找不到一种单行程序来使所有文件的更新时间都超过 5 天，因此您可能不得不使用一些更复杂的逻辑。
/b
Lists only file names without extra info
只列出没有额外信息的文件名
/O-D
Sorts list by reverse date order.
按相反的日期顺序对列表进行排序。
/A-D
Filters to only show non-directory files
过滤器仅显示非目录文件
skip=5
skips the 5 first lines (5 newest ones).
跳过前 5 行（5 最新行）。
回答by aschipfl
This tiny script deletes matching files that are older than 5 days, or more precisely said, that have been modified at least 6 days ago, but always keeps at least the 5 most recently modified ones:
这个小脚本会删除超过 5 天的匹配文件，或者更准确地说，至少 6 天前修改过的文件，但始终至少保留 5 个最近修改的文件：
rem // Change to the target directory:
pushd "C:\Backup" && (
rem // Loop through all matching files but skip the 5 most recently modified ones:
for /F "skip=5 delims= eol=|" %%F in ('
dir /B /A:-D /O:-D "*.zip"
') do (
rem // Delete the currently iterated file only when modified at least 6 days ago:
forfiles /P "%%~dpF." /M "%%~nxF" /D -6 /C "cmd /C ECHO del /F /A @PATH" 2> nul
)
rem // Restore the original working directory:
popd
)
