Check Linux default Access control permissions

  Experimental purposes: Understanding the Linux file format with permissions settings

  Experiment steps:   1. Log in as root into Linux   2. Create a new account with the following command Anyuser/usr/sbin/useradd anyuser   3. Set for Anyuser account Password:  /usr/sbin/passwd   Changing password for user anyuser   New UN IX password   Retype UNIX Password   4. Log off and login with Anyuser account   5. View the contents of the Linux password file:/bin/cat/etc/passwd   Root:x:0:0:root:/bin/bash &nbs 　　P Bin:x:1:1:bin:/bin   Daemon:x:2:2:daemon:/sbin:   mail:x:8:12:mail:/var/spool/mail   NAMED:X "25:25:Bi nd user:/var/named:   dnscache:x:410:405:dnscache user:/var/djbdns:/bin/true   xfs:x:414:414:x Font Server:/ Etc/s11/fs:/bin/false   Postfix:x:415:416:postfix:/var/spool/postrix:   Mtsql:x:416:417mysql server:/var/ Lib/mysql:/bin/bash   Test:x:501:501:condor:/home/condor:/bin/bash   anyuser:x:502:506:zhengya:/home/ Julia:/bin/bash   6. Log off and log in as root   7. Enter the following command:/bin/chmod o-r/etc/  chmod is an order to make a fortune in a file or directory under Linux, for detailed We will introduce it in the operating system Security section.   8Re-log on again with the Anyuser account, trying to list everything under/etc/  9. The command should fail   10 as the system no longer allows everyone to access. As a non-root user, you can use the following command to make your fortune password:   host$ passwd   (current) UNIX password:   New UNIX Password:   Retype new UNIX password:   passwd:al L Authentication Tokens updated successfully