grep -r xxx .

$ grep -r load .
./bak_0413.py:    json_data = unicode_convert(json.load(bbox_info_json_file))
./process_label.py:        data = json.load(f)
./0418_delete_class.py:    json_data = unicode_convert(json.load(bbox_info_json_file))
./test.py:    data = json.load(f)
./0409.py:    json_data = json.load(bbox_info_json_file)
./0417.py:    json_data = unicode_convert(json.load(bbox_info_json_file))
./0413.py:json_data = json.load(bbox_info_json_file)


$ grep -r -l load .
./bak_0413.py
./process_label.py
./0418_delete_class.py
./test.py
./0409.py
./0417.py
./0413.py

$ grep -r -I load .
./bak_0413.py:    json_data = unicode_convert(json.load(bbox_info_json_file))
./process_label.py:        data = json.load(f)
./0418_delete_class.py:    json_data = unicode_convert(json.load(bbox_info_json_file))
./test.py:    data = json.load(f)
./0409.py:    json_data = json.load(bbox_info_json_file)
./0417.py:    json_data = unicode_convert(json.load(bbox_info_json_file))
./0413.py:json_data = json.load(bbox_info_json_file)