New answers tagged fork
If I understand question 1 correctly, no, there's no stack or list of child processes. Somewhere in the structs that the kernel keeps around for a process, there's a PID field and a parent PID field. When a process exits, the parent PID of the exiting process gets a notification via a SIGCHLD (the default SIGCHLD handler is SIG_IGN, so nothing happens unless ...
This will work (do not type any extra spaces): command &>output.file
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