Linux 环境下未安装telnet，会出现以下错误：
| [root@RedHat71 ~]# telnet 129.223.248.159 bash: telnet: command not found... |
解决方案需要安装telnet服务，此处采用yum install，可以参考 RedHat 7 使用Centos7 的yum源
| yum list telnet* 列出安装包 yum install telnet-server 安装server yum install telnet.* 安装客户端 |
[root@RedHat71 ~]# telnet 129.223.248.159 12000
bash: telnet: command not found...
[root@RedHat71 ~]# yum list telnet*
Loaded plugins: fastestmirror, product-id, subscription-manager
Loading mirror speeds from cached hostfile
Available Packages
telnet.x86_64 1:0.17-59.el7 base
telnet-server.x86_64 1:0.17-59.el7 base
[root@RedHat71 ~]# yum install telnet-server
Loaded plugins: fastestmirror, product-id, subscription-manager
Loading mirror speeds from cached hostfile
Resolving Dependencies
--> Running transaction check
---> Package telnet-server.x86_64 1:0.17-59.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
================================================================================
Package Arch Version Repository Size
================================================================================
Installing:
telnet-server x86_64 1:0.17-59.el7 base 40 k
Transaction Summary
================================================================================
Install 1 Package
Total download size: 40 k
Installed size: 55 k
Is this ok [y/d/N]: y
Downloading packages:
telnet-server-0.17-59.el7.x86_64.rpm | 40 kB 00:01
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : 1:telnet-server-0.17-59.el7.x86_64 1/1
Verifying : 1:telnet-server-0.17-59.el7.x86_64 1/1
Installed:
telnet-server.x86_64 1:0.17-59.el7
Complete!
[root@RedHat71 ~]# yum install telnet.*
Loaded plugins: fastestmirror, product-id, subscription-manager
Loading mirror speeds from cached hostfile
Resolving Dependencies
--> Running transaction check
---> Package telnet.x86_64 1:0.17-59.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
================================================================================
Package Arch Version Repository Size
================================================================================
Installing:
telnet x86_64 1:0.17-59.el7 base 63 k
Transaction Summary
================================================================================
Install 1 Package
Total download size: 63 k
Installed size: 113 k
Is this ok [y/d/N]: y
Downloading packages:
telnet-0.17-59.el7.x86_64.rpm | 63 kB 00:01
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : 1:telnet-0.17-59.el7.x86_64 1/1
Verifying : 1:telnet-0.17-59.el7.x86_64 1/1
Installed:
telnet.x86_64 1:0.17-59.el7
Complete!
[root@RedHat71 ~]# telnet 129.223.248.159 12000
Trying 129.223.248.159...
Connected to 129.223.248.159.
