nobody:x:1:0:root:/root root:x:2:0:root:/root 1234:x:3:0:root:/root asdf:x:4:0:root:/root qwer:x:5:1:root:/root zxcv:x:6:0:root:/root 1,2,3,4,5,6 값 확인하기 cat /etc/passwd | cut -d ":" -f2 3번쨰 필드 중에 0이 포함된 아이들만 확인하기 cat /etc/passwd | cut -d ":" -f3 | grep "0"