r: use ls command to get a list of all files under it;
w: can modify the list of files in this directory; that is, create or delete, rename, move files in the directory.
x: can cd to this directory; ls -l and can be used to get detailed information about the properties of all files;
Role access to a directory
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Origin www.cnblogs.com/mu-zhang/p/11359916.html
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