linux-file permissions and directory configuration

File permissions, the main focus in the file and directory on the rwx meaning is different. The main difference: the meaning of W in the directory can be deleted in the directory and files (regardless of the directory and the owner of the file), mobile, new, etc., the directory only r does not have X, means that you can only query the directory file name, but not open the directory.

action commands for permissions and properties of files: Chgrp, Chown, chmod [-R], all of which represent recursive continuous operations. ChownUse R:group can modify both the owner and the group, chmod 777 or chmod u=rwx,g=rx,o=x two different ways to change.

The focus of FHS is to tell us what each directory is used for, which directories can be mounted separately, and which directories must be in one partition from the root directory, which is helpful for understanding Linux planning.

There must be 5 directories in a partition with the root directory, respectively :/etc/lib/bin/dev/sbin . This is because of the security and stability of the root directory, as well as the ease of repair when it crashes.

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