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/* 只搜到文件名 */
find . -name "*.cpp" | grep "image"               
./ac/code/image/image.cpp
./ac/code/image/YUV.cpp
./ac/code/image/RGB.cpp

/* 搜到关键字，未列出文件名 */
find . -name "*.cpp" -exec grep "image.make" {} \;
    obj_jpg_info._ac_write_exif_key("exif.image.make", "AC");
    obj_jpg_info._ac_write_exif_key("exif.image.make", "AC");
                            ac_obj._ac_write_exif_key("exif.image.make", "AC");

/* 搜到关键字，并列出文件名 */
find . -name "*.cpp" | xargs grep "image.make"
./ac/code/amera_device.cpp:    obj_jpg_info._ac_write_exif_key("exif.image.make", "AC");
./ac/code/aideo_encoder.cpp:    obj_jpg_info._ac_write_exif_key("exif.image.make", "AC");
./ac/code/pipi_receiver.cpp:                            ac_obj._ac_write_exif_key("exif.image.make", "AC");