1. Create / guanli directory, create two directories zonghe and jishu (a command) in / guanli
mkdir / guanli / {zonghe, jishu}
2, add a group account zonghe, caiwu, jishu, GID numbers are set to 2001, 2002
-g 2001 Zonghe groupadd
groupadd -g 2002 caiwu
groupadd -g 2003. Journal
3. Create jerry, kylin, tsengia, obama user, which kylin user account expire after 30 December 2020
useradd jerry
useradd -e 2020-12-30 kylin
useradd tsengia
useradd obama
4, adding jerry, kylin, tsengia, obama other users into groups zonghe
gpasswd -M jerry,kylin,tsengia,obama zonghe
5, create a handy, cucci users, cucci account login Shell is set to "/ sbin / nologin"
useradd handy
useradd -s /sbin/nologin cucci
6, adding handy, cucci other users into groups jishu
gpasswd -M handy,cucci jishu
7, all users are required to be added to the aforementioned group within guanli
gpasswd -M jerry,kylin,tsengia,obama,handy,cucci guanli
8, obama users in zonghe group deleted
gpasswd -d obama zonghe
9, set a password for the user jerry is "123456" (using conventional methods)
to set a password to "RedHat" (using the method --stdin) to users cucci
passwd jerry
echo '123' | passwd --stdin cucci
10, the jerry user to lock and view the locked state
passwd -l jerry
passwd -S jerry
11, two xshell open windows, by (who or w) command to check the connection status, and wherein through a fuser kill
who/w
fuser -k /dev/pts/6
12, see cucci users belong to those groups, and to view its details
groups cucci
yum -y install finger
finger cucci
13, manually create an account student
useradd student
14, set permissions and ownership:
/ guanli directory is a group set guanli
is a group / guanli / zonghe directory to Zonghe
/ guanli / directory is a group jishu set jishu
set up three directories are prohibited other user access rights
chown: Guanli [/ Guanli [
chown: Zonghe / Guanli [/ Zonghe
chown:. Journal / Guanli [/. Journal
chown -R & lt 750 / Guanli [
15, to establish a public directory / ceshi
allow all users in the technical group read, write, execute the file
prohibit other users to read, write, execute
setfacl -m g:jishu:rwx /tmp/ceshi
chown -R 770 /tmp/ceshi
16, clear the user password jerry
passwd -d jerry
17, locking the user's password and view the status cucci
passwd -l cucci
passwd -S cucci
18, the user's UID is modified obama 8888
usermod -u 8888 obmam
19, kylin modify the user's password by using the passwd command a maximum period of 60 days
passwd -x 60 kylin
20, see the user handy information id groups finger commands
id handy
groups handy
finger handy