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Am wondering when the directory last modified date is changed. I modified a file inside a particular directory (via FTP), but the directory's LMD did not change. How is it suppose to function?
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A directory is like a file that contains a list of the filenames in it (indeed, you may have accidentally opened a directory in an editor, where you can see it is a mostly-readable list of its contents) -- so it is modified when a file in that directory is added, removed, or renamed.
The mtime (modification time) on the directory itself changes when a file or a subdirectory is added, removed or renamed.
Modifying the contents of a file within the directory does not change the directory itself, nor does updating the modified times of a file or a subdirectory. If you change the permissions on the directory, the ctime changes but the mtime does not.