Recently, I started learning LPIC201, but since there are many resource confirmation commands, I decided to summarize them.
sar [Option] [Display interval (seconds) [Number of times]] Converts the binary data collected by the sadc command into text format and displays various information.
|-u||Show CPU usage|
|-P number or ALL||Show specified CPU usage|
|-r||Show physical memory usage|
|-S||Show swap space usage|
|-b||Disc I/Show the status of O|
|-n DEV||Display information on sent / received packets on the network interface|
|-n EDEV||Displays information about transmission / reception error packets on the network interface|
|-f file name||Specify the log file to retrieve the data|
ss [option] Display information about network status. An alternative to netstat.
|-a||Show all sockets|
|-n||Display address and port numerically|
|w||View logged-in users and their process information|
|mpstat||Shows CPU usage on multiprocessor systems|
|vmstat||Displays detailed information on physical memory and swap area, as well as process and CPU statistics.|
|iostat||Disc I/Display O information and CPU usage|
|netstat||Display information about network status|
|free||Display memory and swap area usage|
|pidstat||Display the operating status of each running process|
|uptime||Display system uptime and average load|
|top||CPU and memory usage status for each process is updated and displayed at regular intervals.|
|htop||Power-up version of top command|
|iotop||Disc I/Display O information for each process|
There are many commands with similar meanings and it is difficult to remember ... I will update it as I learn new commands!