Linux centos 运行telnet命令，出现下面的错误提示：

[root@localhost ~]# telnet 127.0.0.1
-bash: telnet: command not found

解决方法: 安装telnet服务

centos、ubuntu安装telnet命令的方法

    yum list telnet*              列出telnet相关的安装包
    yum install telnet-server     安装telnet服务
    yum install telnet.*          安装telnet客户端

[root@localhost ~]# yum list telnet* 
Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
 * base: mirrors.cn99.com
 * extras: mirrors.shu.edu.cn
 * updates: mirrors.cn99.com
Available Packages
telnet.x86_64                            1:0.17-48.el6                      base
telnet-server.x86_64                     1:0.17-48.el6 

[root@localhost ~]# yum install telnet-server
Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
 * base: mirrors.cn99.com
 * extras: mirrors.shu.edu.cn
 * updates: mirrors.cn99.com
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package telnet-server.x86_64 1:0.17-48.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package               Arch           Version                Repository    Size
================================================================================
Installing:
 telnet-server         x86_64         1:0.17-48.el6          base          37 k

Transaction Summary
================================================================================
Install       1 Package(s)

Total download size: 37 k
Installed size: 54 k
Is this ok [y/N]: y
Downloading Packages:
telnet-server-0.17-48.el6.x86_64.rpm                     |  37 kB     00:00     
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Warning: RPMDB altered outside of yum.
  Installing : 1:telnet-server-0.17-48.el6.x86_64                           1/1 
  Verifying  : 1:telnet-server-0.17-48.el6.x86_64                           1/1 

Installed:
  telnet-server.x86_64 1:0.17-48.el6                                            

Complete!
[root@localhost ~]# 

[root@localhost ~]# yum install telnet.*
Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
 * base: mirrors.cn99.com
 * extras: mirrors.shu.edu.cn
 * updates: mirrors.cn99.com
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package telnet.x86_64 1:0.17-48.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

====================================================================================================================================
 Package                       Arch                          Version                              Repository                   Size
====================================================================================================================================
Installing:
 telnet                        x86_64                        1:0.17-48.el6                        base                         58 k

Transaction Summary
====================================================================================================================================
Install       1 Package(s)

Total download size: 58 k
Installed size: 109 k
Is this ok [y/N]: y
Downloading Packages:
telnet-0.17-48.el6.x86_64.rpm                                                                                |  58 kB     00:00     
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing : 1:telnet-0.17-48.el6.x86_64                                                                                      1/1 
  Verifying  : 1:telnet-0.17-48.el6.x86_64                                                                                      1/1 

Installed:
  telnet.x86_64 1:0.17-48.el6                                                                                                       

Complete!
[root@localhost ~]#