Jilles Tjoelker 03b3a844d0 sh: Set $? to 0 for background commands.
For backgrounded pipelines and subshells, the previous value of $? was being
preserved, which is incorrect.

For backgrounded simple commands containing a command substitution, the
status of the last command substitution was returned instead of 0.

If fork() fails, this is an error.
2011-04-25 20:54:12 +00:00
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