How to modify file permissions in Linux system?

Linux is a free and open source operating system. It is also a POSIX-compliant multi-user, multi-tasking, multi-threading and multi-CPU operating system. It is famous for its stability, security and reliability. , is the system of choice in the server field. In Linux, file permissions are a very important concept, so how to modify file permissions in Linux? The following is a detailed introduction.

To modify file permissions, you can use the chmod command. Basic syntax:

　chmod[option] permission file name

　Among them, the option can be one of the following

　-u indicates owner permissions

　-g represents group permissions

　-O indicates other user permissions

　-a means all user permissions

Permissions can be represented by the following symbols:

　-r read permission

　-w write permission

　-x execution permission

- No permission

Examples are as follows:

　1. Set the owner permissions of the file to read-write-execute, and set the group and other user permissions to read-only:

　chomod u=rwx,g=r,o=r file name

　2. Set the owner permissions of the file to read, write and execute, and set the group and other user permissions to no permissions:

　chmod u=rwx,g=,o= file name

　3. Set the owner permissions of the file to read-only, and set the group and other user permissions to read-only:

　chmod u=r,g=r,o=r file name

　4. Set the owner permissions of the file to read-only, and set the group and other user permissions to no permissions:

　chmod u=r,g=,o= file name

　5. Set the owner permissions of the file to read-write, and set the group and other user permissions to read-only:

　chmod u=rw,g=r,o=r file name

　6. Set the owner permissions of the file to read and write, and set the group and other user permissions to no permissions:

　chmod u=rw,g=,o= file name

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