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If targetFileId is specified, then the file is dup to this specified file ID. Normally this is stdin, stdout, or stderr. The dup command will handle flushing output and closing this file. The target file should be open if it is one of stdin, stdout, or stderr and the process is not going to do an execl. Otherwise internal C code that uses one of these files via direct access to stdio FILE struct may behave strangely or fail.