Unix面试题（英文 附答案）2-4

61，What file contains a listing of default file systems?A   fstab
62，What command is used to mount a file system read-only?  C  mount -r    63, You want all the file systems listed in fstab to have quotas. What command would allow you to do this without having to enable each one separately?
 A  quotaon -a   
64, What command would allow you to edit an existing quota?  D  edquota
65,Which of the following commands can be used to change the owner of a particular file?    C  chown  
66，When setting file permissions using octal settings, what value represents read access?   D   4
67，When setting file permissions using octal settings, what value represents write access?  C  2 
68，When setting file permissions using octal settings, what value represents execute access?  C  1 
69，When setting file permissions using octal settings, what value represents read and write access?  B  6 
70, When setting file permissions using octal settings, what value represents read, write, and execute access?A  7 
71，When setting file permissions using octal settings, what value represents read and execute access?A  5  
72，What is the purpose of a umask?   D   determine default file permissions
73，There is a file with the following permissions: -rw-rw-r- What rights does the owner have?   C  read-write
74，There is a file with the following permissions: -rw-rw-r- What rights does the owner's group have?   C   read-write 
75, There is a file with the following permissions: -rw-rw-r- What rights do users other than the owner and the owner's group have? A  read    
76, There is a file with the following permissions: -rw-r-r- What rights does the owner have?A  read-write 
77, There is a file with the following permissions: -rw-r-r- What rights does the owner's group have? B  read 
78，What command can be used to list the modules that are currently resident on the system?   D   lsmod
79，The root user always has a UID of ______A   0 
80，Your system has a default mode of 666. You specify a umask value of 022. What will be the default permissions? C  644