怎么使用Xshell连接服务器并安装JDK

[root@dwl ~]# rz

-bash: rz: 未找到命令

[root@dwl ~]# yum install -y lrzsz

已加载插件：fastestmirror, langpacks

Determining fastest mirrors

 * base: mirrors.aliyun.com

 * extras: mirror.lzu.edu.cn

 * updates: mirrors.neusoft.edu.cn

base                                                                                         | 3.6 kB  00:00:00    

extras                                                                                       | 3.4 kB  00:00:00    

updates                                                                                      | 3.4 kB  00:00:00    

(1/4): base/7/x86_64/group_gz                                                                | 166 kB  00:00:00    

(2/4): extras/7/x86_64/primary_db                                                            | 174 kB  00:00:01    

(3/4): updates/7/x86_64/primary_db                                                           | 5.0 MB  00:00:16    

(4/4): base/7/x86_64/primary_db                                                              | 5.9 MB  00:00:20    

正在解决依赖关系

--> 正在检查事务

---> 软件包 lrzsz.x86_64.0.0.12.20-36.el7 将被 安装

--> 解决依赖关系完成

依赖关系解决

====================================================================================================================

 Package                  架构                      版本                              源                       大小

====================================================================================================================

正在安装:

 lrzsz       

             x86_64           

                     0.12.20-36.el7          

                              base            

                                      78 k  

事务概要

====================================================================================================================

安装  1 软件包

总下载量：78 k

安装大小：181 k

Downloading packages:

警告：/var/cache/yum/x86_64/7/base/packages/lrzsz-0.12.20-36.el7.x86_64.rpm: 头V3 RSA/SHA256 Signature, 密钥 ID f4a80eb5: NOKEY

lrzsz-0.12.20-36.el7.x86_64.rpm 的公钥尚未安装

lrzsz-0.12.20-36.el7.x86_64.rpm                                                              |  78 kB  00:00:00    

从 file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7 检索密钥

导入 GPG key 0xF4A80EB5:

 用户ID     : "CentOS-7 Key (CentOS 7 Official Signing Key) <security@centos.org>"

 指纹       : 6341 ab27 53d7 8a78 a7c2 7bb1 24c6 a8a7 f4a8 0eb5

 软件包     : centos-release-7-5.1804.el7.centos.x86_64 (@anaconda)

 来自       : /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

Running transaction check

Running transaction test

Transaction test succeeded

Running transaction

  正在安装    : lrzsz-0.12.20-36.el7.x86_64                                                                     1/1

  验证中      : lrzsz-0.12.20-36.el7.x86_64                                                                     1/1

已安装:

  lrzsz.x86_64 0:0.12.20-36.el7                                                                                    

完毕！

[root@dwl ~]#

sudo tar -vxf jdk-8u181-linux-x64.tar.gz -C/usr/local

[root@dwl ~]# sudo vim /etc/profile

export JAVA_HOME=/usr/local/jdk1.8.0_181

export JRE_HOME=${JAVA_HOME}/jre

exportCLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib

export PATH=${JAVA_HOME}/bin:$PATH

[root@dwl ~]# source /etc/profile

[root@dwl ~]# java -version

java version "1.8.0_181"

Java(TM) SE Runtime Environment (build 1.8.0_181-b13)

Java HotSpot(TM) 64-Bit Server VM (build 25.181-b13, mixed mode)