Take notes on Linux Private food from laruence (11) -- System Monitoring 1

1. Understand the system status

Uname: displays system information.

Hostname: displays the host name.

Last: List Recent user logins

Lastlog: lists the recent logon status of each user.

Free: displays memory usage

You can also use vmstat to display detailed memory information.

Top: System Monitor

Ii. Process

The system completes the work through processes.

Each process has an independent process number. The system calls the process number to schedule and manipulate the process.

The system's original process is init, And the init PID is always 1

One process can generate another process. All processes except init have parent processes.

Iii. Query Process

Query the process's command ps [option]

Ps-A or ps-e lists all processes

Ps-a displays all processes unrelated to the terminal

Ps-u lists processes of Valid users

Ps-x list complete information

Ps-l displays process information in detail

Ps-f displays process information in a complete way

Pstree can be used to represent the parent-child relationship of a process in a tree-like manner.

Top is a common system monitoring tool (as mentioned earlier)