【简答题】执行命令 ls – l 时,某行显示如下: -rw-r--r-- 1 chris chris 207 jul 20 11:58 mydata (1)执行命令useradd Tom后,用户Tom对该文件具有什么权限? (2)如何使任何用户都可以读写执行该文件? (3)如何把该文件属主改为用户root ?
【简答题】A.They couldn't get enough income to keep them running. B.Young people couldn't afford to pay the tuition fees. C.Keeping them running at the same level would cost much more. D.Social services need mo...