systemctl

图形界面及命令行界面

设置开机默认界面为图形界面

systemctl set-default graphical.target

设置开机默认界面为命令行界面

systemctl set-default multi-user.target

开机重启即可生效，当然也可不重启切换
切换为图形界面

systemctl start graphical.target

切换为命令行界面

systemctl start multi-user.target

服务控制

systemctl status service
systemctl start service
systemctl restart service
systemctl stop service
systemctl enable service
systemctl disable service

服务文件

服务位置

/usr/lib/systemd/system/

[Unit]
Description=OpenSSH server daemon
Documentation=man:sshd(8) man:sshd_config(5)
After=network.target sshd-keygen.service
Wants=sshd-keygen.service

[Service]
EnvironmentFile=/etc/sysconfig/sshd
ExecStart=/usr/sbin/sshd -D $OPTIONS
ExecReload=/bin/kill -HUP $MAINPID
Type=simple
KillMode=process
Restart=on-failure
RestartSec=42s

[Install]
WantedBy=multi-user.target