使用tee(或等效文件)，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.

我看过logrotate，但是它不能实时工作.据我了解，这是一个并行运行的清理"作业.

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

什么是正确的解决方案?我想我会写一个很小的脚本来做，但是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:

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

会给... 始终将最新的日志文件写入为: 日志/my_program_log

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

然后，将其填满...重命名为log/my_program_log000001并启动新的日志/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

使用拆分:

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

或者，如果您不想看到输出，则可以直接通过管道进行拆分:

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

my_program | split -d -b 100000 -

至于日志轮转，coreutils中没有工具可以自动进行轮转.您可以创建符号链接并使用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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