Linux experiment report (1) - file permissions and management - 2021.5.22

1. Configuration requirements:

• Virtual machine VM15.0 and above
• centos7.0 version
• windows7 or windows10 host

2. The purpose of the experiment

• Proficient in the related methods of files and directories, file permissions and management
• Learn how to modify file permissions and how to assign permissions during configuration

3. Experimental requirements: (all the following operations should be completed under the root user)

1. Create a new user named 180xname (x is the class number, name is your own name), and meet the following requirements: the user id is 2000, and the password is redhat123.

useradd -u 2000 1802huangjie

echo redhat123 |passwd --stdin 1802huangjie

2. Create a new user named zhangsan with class as its subgroup.

groupadd class

useradd -G class zhangsan

3. Create a new user named lisi with class as its subgroup.

useradd -G class lisi

4. Create a new user named wangwu, which does not belong to the class group, and set its shell as a non-loginable shell.

useradd -s /sbin/nologin wangwu

5. The passwords of the three users zhangsan, lisi, and wangwu are all set to 123456 by the echo announcement.

echo 123456 | passwd --stdin zhangsan
echo 123456 | passwd --stdin lisi
echo 123456 | passwd --stdin wangwu

6. Copy the file /etc/hosts to the /var/tmp directory and configure the permissions of the /var/tmp/hosts file as follows:

cp -p /etc/hosts /var/tmp

• The owner of the file is 180xname, and the group to which the file belongs is 180xname.

chown 1802huangjie:1802huangjie /var/tmp/hosts

• This file has no execute permission for anyone.

chmod a-x /var/tmp/hosts

• User zhangsan has read and write permissions on this file.

setfacl -m user:zhangsan:rw /var/tmp/hosts

• User lisi can neither read nor write to this file.

setfacl -m user:lisi:--- /var/tmp/hosts

• All other users (including existing users and users created in the future) have read access to the file.

setfacl -m m::r /var/tmp/hosts

4. Next: Linux Experiment Report (2) - Disk Storage Management

Linux Experiment Report (2) - Disk Storage Management