A. 正确 B. 错误
A. 1,$s/abc/cba/g B. 5,20/abc/cba/g C. 5-20s/abc/cba/g D. 5,20s/abc/cba/g
A. /etc/default/passwd B. /etc/default/useradd C. /etc/profile D. /etc/fsta
A. #reboot B. #halt-p C. #sync/#reboot D. #shutdown-r