What Does the F5 Key Do in htop on Ubuntu?

This article provides a concise explanation of the F5 key function within the htop process viewer on Ubuntu Linux. It details how pressing this key alters the process display mode to reveal hierarchical relationships between running tasks.

In the htop system monitor, pressing the F5 key toggles the tree view mode. When this mode is active, the list of processes changes from a flat list to a hierarchical structure. Each child process becomes indented underneath its parent process. This visualization allows you to see exactly which application or service spawned specific background tasks.

Using the tree view is particularly useful for system administration and debugging. It helps identify runaway processes that belong to a specific parent application or understand the dependency chain of services. Pressing the F5 key again switches the display back to the standard sorted list view. This toggle provides a quick way to analyze process relationships without exiting the program.