单项选择题
Which of the following commands will change all CR-LF pairs in an imported text file， userlist.txt， to Linux standard LF characters and store it as newlist.txt？（）
A. tr ’\r\n’ " < userlist.txt > newlist.txt B. tr -c ’\n\r’ " < newlist.txt > userlist.txt C. tr -d \r¯ < userlist.txt > newlist.txt D. tr \r¯\n¯ userlist.txt newlist.txt E. tr -s ®^M’¡®^J’ userlist.txt newlist.tx
单项选择题 Youhaveread/writepermissiononanordinaryfilefoo.YouhavejustrunInfoobar.Whatwouldhappenifyouranrmfoo？（）
填空题 Whatapplicationcanbeusedinplaceofxhost？Pleaseenteronlythenamewithoutpath.Answer：（）
单项选择题 WhatisthedifferencebetweenthE.removeandthE.purgeactionwiththedpkgcommand？（）
