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input 예시파일
"""
Alice-student
98
Bob-student
70
Carol-teacher
91
Danny-student
42
Ellie-teacher
20
"""
명령어
$grep "teacher" input.txt > output.txt
출력
Carol-teacher
Ellie-teacher
명령어
grep -A1 "teacher" input.txt > output.txt
출력
Carol-teacher
91
Ellie-teacher
20
명령어
$grep -hnr -A1 "teacher" input.txt > output.txt
출력
5:Carol-teacher
6:91
9:Ellie-teacher
10:20
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