Process, system performance and process concepts Scheduled Tasks kernel functions: process management, file system, network functions, memory management, drivers, security features such as process ID (processID, PID) number is used to mark each process UlD, GID, and SEliunux Context defines access to the file system and access permissions are usually inherited from the period of the existence of life users to perform processes
task struct: the way the Linux kernel data structures to store process information task list: task struct consisting of multiple tasks list process created: init: first process process: by the parent process to create a parent-child relationship, COW FORK (), clone ( ) tools to extract text file contents: cat, more, less file interception: head, tail extraction columns: cut and sort statistics: sotr, wc drawn by keyword: grep user user liunx users: liunx user: Username / UID administrator: root, 0 average user: 1-60000 automatic distribution system users: 1-499, 1-999 ( centos7) access to the daemon login user rights assignments resource: 500 +, 1000 + (cengto7 ) interactive logon
