Question: what is s and g in sed command
[{'answer': 'substitute', 'provenance': [{'wikipedia_id': '27163', 'title': 'Sed', 'start_paragraph_id': 14, 'start_character': 134, 'end_paragraph_id': 14, 'end_character': 144, 'bleu_score': 1.0, 'section': 'Section::::Usage.:Substitution command.\n'}]}, {'answer': 'global', 'provenance': [{'wikipedia_id': '27163', 'title': 'Sed', 'start_paragraph_id': 14, 'start_character': 177, 'end_paragraph_id': 14, 'end_character': 183, 'bleu_score': 1.0, 'section': 'Section::::Usage.:Substitution command.\n'}]}, {'provenance': [{'wikipedia_id': '27163', 'title': 'Sed', 'start_paragraph_id': 14, 'start_character': 0, 'end_paragraph_id': 14, 'end_character': 669, 'bleu_score': 0.8962137948357981, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1063819638686414299}, 'section': 'Section::::Usage.:Substitution command.\n'}]}]