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Various bits of what is known about busybox shells, in no particular order.
+2008-02-14
+ash: does not restore tty pgrp if killed by HUP. Symptom: Midnigth Commander
+is backgrounded if you started ash under it, and then killed it with HUP.
+
2007-11-23
hush: fixed bogus glob handling; fixed exec <"$1"; added test and echo builtins