UNIX System Process

A system process with a PID of 0 is a scheduling process called swapper or sched. No program corresponds to the disk, which is part of the UNIX kernel.
If the PID is 1, The init process is created by the kernel during the system self-lifting. The process is in/etc/init or the new/sbin/init version; this process is responsible for system creation after the system is initiated; init requires the system to present the file (/etc/rc *) and bring the system into a certain State (for example, multi-user State ). You can check that init is the Jingcheng manager in the operating system. It is the path of the original document (upload er.exe on Windows ).
The pagedaemon process with PID 2 is responsible for supporting the pagination of the virtual storage system. The bucket swapper is also a system process.
There are several other system processes. Of course, different UNIX may have their own special system processes, but the PID is usually a very small integer.