Under what condition is the date of a directory (shown with ls -l) updated? Is it when the directory is created, or when a file somewhere below the directory is updated or some other time? I make weekly backups of the user accounts on my server box. Because space and CD media are in limited supply (at least for me) I write the backups to CD once a month. Full backups are made on Sunday and after a new Sunday's backup has been made I edit the previous Sunday's backup and delete all files that hadn't been changed recently when that backup (the one I'm editing) was made. This is a somewhat time-consuming method. I was just wondering if the directory date could give me a clue as to the date of the most recent file updated under that directory...
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