Written in front: 1. Everything is a document; 2. virtual files in memory; privileged files
1. Everything is a file, if we use the command line to view all groupings or open user management in the graphical interface
You will find that there are many groups of users, such as sudo groups
They use a decentralized approach to ensure that the system runs stably while maintaining the root overhead. Complete various tasks
2. Our older generation, Longlongage is very dangerous when looking at the kernel state and writing some privileged programs to access the data structures in the kernel directly.
Now, let's use/proc. /proc does not exist on the disk, he is the kernel when the state changes in memory created in the dynamic folder, you can learn from the kernel information.
First draft, placeholder manuscript, amendment to be continued ....
Further understanding of the Linux kernel interface