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top

The top command line can display the system's operating status in real time. With the top command line, you can view the system load, CPU usage, memory usage, process information, etc.

Display process memory usage (-l)

Display thread information (-H)

Specify the username whose process information is to be displayed (-u)

Display information for the specified process (-p)

Set the number of processes to be displayed (-n)

Set the time interval between two refreshes (-d)

Set the sorting method (-s)

Display memory information (-m)

Display the sum of process and CPU states (-t)

Example

Display system load and CPU usage: top
Display process information: top -u username
Display information for a specified process: top -p pid
Refresh every 5 seconds: top -d 5
Display memory usage: top -l
Display thread information: top -H
Display a summary of processes and CPU states: top -t
Display process memory usage: top -m