-mtime在bash脚本中是什么意思？

Question

我有一个工作脚本：

#!/bin/bash
find ~/.backups/ -type f -name '*.tgz' -mtime +0.5 -exec rm {} \;

没有错。只是想知道-mtime是什么以及它是如何计算的。似乎无法在Google上大获成功。

Answer 1

来自man find：

-mtime n
       File's data was last modified n*24 hours ago.  See the
       comments for -atime to understand how rounding affects the
       interpretation of file modification times.