[Bug 220587] /bin/sh Incorrect options handling

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220587

Benjamin Takacs <nimaje+fbz@bureaucracy.de> changed:

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--- Comment #19 from Benjamin Takacs <nimaje+fbz@bureaucracy.de> ---
(In reply to Martijn Dekker from comment #17)
POSIX requires  system(command);  to behave *as if*  sh -c -- command  was
called, for safety, because POSIX requires sh to handle options after -c.

I think the better design would be to only allow -c as last argument to sh, as
the SYNOPSIS in our man page says too, that would eliminate all bugs where
command could potentially start with -, without requiring everyone to write -c
-- or have a bug in waiting.

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