When will the modified time of folder be changed, on both of windows and linux? I know the modified time changed when its inode is changed. But when will the inode of folder be changed?
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Windows and Linux differ on this; indeed, within both, this is largely dependent upon rules present within the filesystem format (NTFS, EXT4, XFS, and so on).
Microsoft give some details on how it works in NTFS here.
For EXT, there are some details in the ext wiki.
Other filesystems will have this information in similar sources.