Linux top Command

The Linux top command is used to display real-time dynamic information about processes.

Usage permission: All users.

top [-] [d delay] [q] [c] [S] [s] [i] [n] [b]

Parameter Description:

d : Change the display update speed, or press 's' in the interactive command line.
q : Display speed with no delay. If the user has superuser privileges, top will run with the highest priority.
c : Toggle display mode. There are two modes: one shows only the executable file name, and the other shows the full path and name.
S : Cumulative mode, which accumulates the CPU time of completed or disappeared child processes (dead child process).
s : Safe mode, which disables interactive commands to avoid potential risks.
i : Do not show any idle or useless (zombie) processes.
n : Number of updates before exiting top.
b : Batch mode, used in conjunction with the "n" parameter to output top results to a file.

Display process information

# top

Display full commands

# top -c

Display process information in batch mode

# top -b

Display process information in cumulative mode

# top -S

Set the number of information updates

top -n 2

// Indicates that the update will terminate after two updates

Set the information update time

# top -d 3

// Indicates that the update interval is 3 seconds

Display information about a specific process

# top -p 139

// Displays information about the process with PID 139, including CPU and memory usage

Display and exit after ten updates

top -n 10

Users will not be able to use interactive commands to command processes

top -s