使用 tee(或等效物)但限制最大文件大小或旋转到新文件 [英] Use tee (or equivalent) but limit max file size or rotate to new file

问题描述

我想从 UNIX 进程捕获输出，但限制最大文件大小和/或旋转到新文件.

I would like to capture output from a UNIX process but limit max file size and/or rotate to a new file.

我见过 logrotate，但它不能实时工作.据我了解，这是一项并行运行的清理"工作.

I have seen logrotate, but it does not work real-time. As I understand, it is a "clean-up" job that runs in parallel.

正确的解决方案是什么?我想我会写一个小脚本来做到这一点，但我希望现有的文本工具有一种简单的方法.

What is the right solution? I guess I will write a tiny script to do it, but I was hoping there was a simple way with existing text tools.

想象一下:

my_program | tee --max-bytes 100000 log/my_program_log

会给...始终将最新的日志文件写为:日志/my_program_log

Would give... Always writing latest log file as: log/my_program_log

然后，当它填满时...重命名为 log/my_program_log000001 并开始一个新的 log/my_program_log.

Then, as it fills... renamed to log/my_program_log000001 and start a new log/my_program_log.

推荐答案

use split:

my_program | tee >(split -d -b 100000 -)

或者如果你不想看到输出，你可以直接用管道分割:

Or if you don't want to see the output, you can directly pipe to split:

my_program | split -d -b 100000 -

至于日志轮换，coreutils 中没有自动执行的工具.您可以创建一个符号链接并使用 bash 命令定期更新它:

As for the log rotation, there's no tool in coreutils that does it automatically. You could create a symlink and periodically update it using a bash command:

while ((1)); do ln -fns target_log_name $(ls -t | head -1); sleep 1; done

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