在使用文件时截断文件 (Linux) [英] Truncating a file while it's being used (Linux)

问题描述

我有一个进程将大量数据写入标准输出，我将其重定向到日志文件.我想通过偶尔将当前文件复制到新名称并截断它来限制文件的大小.

I have a process that's writing a lot of data to stdout, which I'm redirecting to a log file. I'd like to limit the size of the file by occasionally copying the current file to a new name and truncating it.

我常用的截断文件的技巧，比如

My usual techniques of truncating a file, like

cp /dev/null file

不工作，大概是因为进程正在使用它.

don't work, presumably because the process is using it.

有什么办法可以截断文件吗?或者删除它并以某种方式将进程的标准输出与新文件相关联?

Is there some way I can truncate the file? Or delete it and somehow associate the process' stdout with a new file?

FWIW，这是第三方产品，我无法修改以更改其日志记录模型.

FWIW, it's a third party product that I can't modify to change its logging model.

EDIT 重定向文件似乎与上面的副本存在相同的问题 - 下次写入文件时，文件会恢复到以前的大小:

EDIT redirecting over the file seems to have the same issue as the copy above - the file returns to its previous size next time it's written to:

ls -l sample.log ; echo > sample.log ; ls -l sample.log ; sleep 10 ; ls -l sample.log
-rw-rw-r-- 1 user group 1291999 Jun 11  2009 sample.log
-rw-rw-r-- 1 user group 1 Jun 11  2009 sample.log
-rw-rw-r-- 1 user group 1292311 Jun 11  2009 sample.log

推荐答案

查看实用程序 split(1)，它是 GNU Coreutils 的一部分.

Take a look at the utility split(1), part of GNU Coreutils.

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