I don't know the answer, but I do know that
system("su - user -c /mycode/getcwd $targetdir")
is less secure than
system('su', '-', 'user', '-c', '/mycode/getcwd', $targetdir)
since the arguments are not succeptable to shell interpretation in the latter.

In reply to Re: getcwd() as different user by ikegami
in thread getcwd() as different user by 0xbeef

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