Process management of day02 operation

Linux Basics -- process （ management , see ,kill Process control , Operation control ）_chenshuai199533 The blog of -CSDN Blog Linux Basics -- process （ management , see ,kill Process control , Operation control ）https://blog.csdn.net/chenshuai199533/article/details/1247035351. Need modification /etc/passwd File attribute . Requirements can only be added , No modification allowed .

 

2./tmp/im Handbook for new employees , It is required to modify the file properties , The contents of the file cannot be modified , You can only view the contents of the file

3.chattr In command a and i Attribute distinction

i: namely Immutable, The system does not allow any changes to this file

a： namely Append Only, The system only allows appending data after this file , No overwriting or truncation of this file is allowed

A： namely Atime, Tell the system not to change the last access time to this file  

4. Statically check what commands are available for the process ？ There are several kinds of you know ？

Two kinds of ：ps auxf | process     ps -elf | process

5. Change the hostname to testpm-server

 

6. How to view the port of the service ？

Install first losf    Reuse lsof see  

7. How to view nginx Whether the process of is running ？

8. How to check the version and kernel of your operating system ？

 

9. What is a process ？

A process is a dynamic execution of a program with certain independent functions on a dataset , Is an independent unit of the operating system for resource allocation and scheduling , Is the carrier of the application program . Process is an abstract concept , There has never been a unified standard definition .

The process is generally programmed by 、 Data collection and process control block are composed of three parts .

The program is used to describe the functions to be completed by the process , Is the instruction set that controls the execution of the process ;
A data set is the data and workspace that a program needs to execute ;
Program control block (Program Control Block, abbreviation PCB), Contains process description and control information , Is the only sign that a process exists

10. How to find someone invading your server ？

11. What commands can be used to view the program running in the background ？

12. take nginx process PID Number is 1142 Forcibly kill with what order ？

13. Please list and view cpu The order of load, you know ？

14.load average： 0.40,0.21,0.12 What do they mean ？

15. Please check with the command httpd Of PID Number ？