The top command is quite useful in Red Hat Enterprise Linux. This is a list of common keystrokes that can be used in top:
| Key | Purpose |
|---|---|
| ? or h | Help for interactive keystrokes. |
| l, t, m | Toggles for load, threads, and memory header lines. |
| 1 | Toggle showing individual CPUs or a summary for all CPUs in header. |
| s or d | Change the refresh (screen) rate, in decimal seconds (e.g., 0.5, 1, 5). |
| b | Toggle reverse highlighting for Running processes; default is bold only. |
| B | Enables use of bold in display, in the header, and for Running processes. |
| H | Toggle threads; show process summary or individual threads. |
| u, U | Filter for any user name (effective, real). |
| M | Sorts process listing by memory usage, in descending order. |
| P | Sorts process listing by processor utilization, in descending order. |
| k | Kill a process. When prompted, enter PID, then signal. |
| r | Renice a process. When prompted, enter PID, then nice_value. |
| W | Write (save) the current display configuration for use at the next top restart. |
| q | Quit. |
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