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Da gibt es hier ein englischen umfangreichen und erklärenden Post:

[Tutorial] Understanding and working with UNIX filesystems and permissions

Difficulty: ★★★☆☆ Note: This post is meant as a tutorial. Please do not post on this thread regarding any problems you’re having with permissions, but start a new thread instead. Thank you. PREAMBLE: THE HISTORICAL BACKGROUND If you are new to the world of GNU/Linux ─ and especially if you come from the Microsoft Windows ecosystem ─ then you will undoubtedly have already noticed that GNU/Linux handles permissions and storage volumes quite differently from what you might be used to …