答案：

See the solution below in Explanation.
Explanation:
Solution:
* Set the hostname:
hostnamectl set-hostname server1.example.com
* Configure the existing connection with a static IP:
nmcli connection modify ens160 ipv4.address 192.168.1.2/24 ipv4.gateway 192.168.1.1 ipv4.dns 1.1.1.1 ipv4.
method manual connection.autoconnect yes
* Bring the connection up:
nmcli connection up ens160
Detailed Explanation:
* hostnamectl is the correct modern command for changing the system hostname.
* nmcli is the correct tool for RHEL 10 network configuration because the old ifcfg style is removed in
RHEL 10, and NetworkManager keyfiles are the supported model.
* ipv4.method manual tells NetworkManager to use static addressing.
* connection.autoconnect yes ensures the profile activates automatically after reboot.
* nmcli connection up ens160 applies the changes immediately.

答案：

Solution:
[root@node1 ~]# vim /usr/local/bin/systeminfo
#!/bin/bash
ps -xao user,pid,vsz,rss,%cpu --sort=pcpu
Using sort:
#!/bin/bash
ps -xao user,pid,vsz,rss,%cpu | sort -fnk 5
Verify:
[root@node1 ~]# chmod +x /usr/local/bin/systeminfo
[root@node1 ~]# systeminfo
Explanation of ps -xao:
x - Display processes without a controlling terminal, and show the full path of each command
a - Display all processes associated with a terminal, except session leaders
o - User-defined output format

答案：

Solution:
[root@node1 ~]# systemctl status crond
[root@node1 ~]# systemctl enable crond
[root@node1 ~]# crontab -e -u harry
23 14 * * * /usr/bin/echo hello
# Verification
[root@node1 ~]# crontab -l -u harry

答案：

Solution:
Create the group:
[root@node1 ~]# groupadd admins
Create the directory:
[root@node1 ~]# mkdir /home/test
Set the group ownership:
[root@node1 ~]# chgrp admins /home/test
Set the permissions:
[root@node1 ~]# chmod 2770 /home/test
Verify:
[root@node1 ~]# ls -ld /home/test
drwxrws--- root admins /home/test