如何在-exec參數中使用重定向

如何在-exec參數中使用重定向   Clear log file content without impacting service that is running (in batch):   find . -name "*.log" -exec bash -c ">{}" \;   Subsitute file content in batch:   find -name "*.xml" -exec bash -c "sed -e 's/aaa/bbb/' {} > {}" \;