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Various bits of what is known about busybox shells, in no particular order.
+2007-04-22
+hush: "sleep 1 | exit 3; echo $?" prints 0 because $? is substituted
+_before_ pipe gets executed!! run_list_real() already has "pipe;echo"
+parsed and handed to it for execution, so it sees "pipe"; "echo 0".
+
2007-04-21
hush: removed setsid() and made job control sort-of-sometimes-work.
Ctrl-C in "rm -i" works now except for SH_STANDALONE case.