wget 安装：Package wget-1.14-18.el7_6.1.x86_64 already installed and latest version

wget 命令是 Linux 系统中最常用的指定链接文件下载命令，wget 稳定性很好，即使服务器带宽很小，不稳定，该命令也很实用。如果服务器存在网络不稳定现象导致文件下载失败，wget 会自动尝试重新下载，直到文件下载完毕。如果因为本地带宽或服务器其他操作中断了下载，下次使用 wget 执行同链接下载，它会自动从中断的地方继续下载文件。

wget 用法示例如下：

[root@iZuf6crxor2b7uwzq9sutyZ local]# wget http://download.redis.io/releases/redis-4.0.8.tar.gz
-bash: wget: command not found

上述命令报错：-bash: wget: command not found。原因是系统中没有安装 wget，我们只要执行安装命令安装即可。

安装方法很简单，只需执行命令 “yum -y install wget”，即可完成安装。

[root@iZuf6crxor2b7uwzq9sutyZ local]# yum -y install wget
Loaded plugins: fastestmirror
Determining fastest mirrors* centos-sclo-rh: mirrors.aliyun.com* centos-sclo-sclo: mirrors.aliyun.com
base                                                                                                                                            | 3.6 kB  00:00:00
centos-sclo-rh                                                                                                                                  | 3.0 kB  00:00:00
centos-sclo-sclo                                                                                                                                | 3.0 kB  00:00:00
epel                                                                                                                                            | 4.7 kB  00:00:00
extras                                                                                                                                          | 2.9 kB  00:00:00
mysql-connectors-community                                                                                                                      | 2.6 kB  00:00:00
mysql-tools-community                                                                                                                           | 2.6 kB  00:00:00
mysql57-community                                                                                                                               | 2.6 kB  00:00:00
updates                                                                                                                                         | 2.9 kB  00:00:00
(1/8): epel/x86_64/group_gz                                                                                                                     |  96 kB  00:00:00
(2/8): extras/7/x86_64/primary_db                                                                                                               | 225 kB  00:00:00
(3/8): epel/x86_64/updateinfo                                                                                                                   | 1.0 MB  00:00:00
(4/8): epel/x86_64/primary_db                                                                                                                   | 6.9 MB  00:00:00
(5/8): updates/7/x86_64/primary_db                                                                                                              | 5.7 MB  00:00:00
(6/8): mysql-connectors-community/x86_64/primary_db                                                                                             |  72 kB  00:00:00
(7/8): mysql-tools-community/x86_64/primary_db                                                                                                  |  85 kB  00:00:00
(8/8): mysql57-community/x86_64/primary_db                                                                                                      | 258 kB  00:00:00
Package wget-1.14-18.el7_6.1.x86_64 already installed and latest version
Nothing to do

上述安装命令结束时，提示：

Package wget-1.14-18.el7_6.1.x86_64 already installed and latest version
Nothing to do

说明 wget 已经存在，使用如下命令查找 wget 发现确实存在。

[root@iZuf6crxor2b7uwzq9sutyZ ~]# rpm -qa | grep "wget"
wget-1.14-18.el7_6.1.x86_64

wget 存在，但是使用时仍然提示 “-bash: wget: command not found”，解决方法：卸载 wget，再次安装。

卸载命令：yum remove wget。

[root@iZuf6crxor2b7uwzq9sutyZ ~]# yum remove wget
Loaded plugins: fastestmirror
Resolving Dependencies
--> Running transaction check
---> Package wget.x86_64 0:1.14-18.el7_6.1 will be erased
--> Finished Dependency ResolutionDependencies Resolved=======================================================================================================================================================================Package                             Arch                                  Version                                          Repository                            Size
=======================================================================================================================================================================
Removing:wget                                x86_64                                1.14-18.el7_6.1                                  @base                                2.0 MTransaction Summary
=======================================================================================================================================================================
Remove  1 PackageInstalled size: 2.0 M
Is this ok [y/N]: y
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transactionErasing    : wget-1.14-18.el7_6.1.x86_64                                                                                                                         1/1
warning: file /usr/bin/wget: remove failed: No such file or directoryVerifying  : wget-1.14-18.el7_6.1.x86_64                                                                                                                         1/1 Removed:wget.x86_64 0:1.14-18.el7_6.1                                                                                                                                        Complete!

提示卸载成功。再次安装，命令如下。

[root@iZuf6crxor2b7uwzq9sutyZ ~]# yum -y install wget
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile* centos-sclo-rh: mirrors.aliyun.com* centos-sclo-sclo: mirrors.aliyun.com
Resolving Dependencies
--> Running transaction check
---> Package wget.x86_64 0:1.14-18.el7_6.1 will be installed
--> Finished Dependency ResolutionDependencies Resolved=======================================================================================================================================================================Package                             Arch                                  Version                                           Repository                           Size
=======================================================================================================================================================================
Installing:wget                                x86_64                                1.14-18.el7_6.1                                   base                                547 kTransaction Summary
=======================================================================================================================================================================
Install  1 PackageTotal download size: 547 k
Installed size: 2.0 M
Downloading packages:
wget-1.14-18.el7_6.1.x86_64.rpm                                                                                                                 | 547 kB  00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transactionInstalling : wget-1.14-18.el7_6.1.x86_64                                                                                                                         1/1 Verifying  : wget-1.14-18.el7_6.1.x86_64                                                                                                                         1/1 Installed:wget.x86_64 0:1.14-18.el7_6.1                                                                                                                                        Complete!

提示安装成功，此时再次使用 wget 下载 redis tar 包，即可完成下载。

[root@iZuf6crxor2b7uwzq9sutyZ ~]# wget http://download.redis.io/releases/redis-4.0.8.tar.gz
--2021-03-17 11:22:45--  http://download.redis.io/releases/redis-4.0.8.tar.gz
Resolving download.redis.io (download.redis.io)... 45.60.125.1
Connecting to download.redis.io (download.redis.io)|45.60.125.1|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1729973 (1.6M) [application/octet-stream]
Saving to: ‘redis-4.0.8.tar.gz’100%[=============================================================================================================================>] 1,729,973   4.30MB/s   in 0.4s   2021-03-17 11:22:46 (4.30 MB/s) - ‘redis-4.0.8.tar.gz’ saved [1729973/1729973]

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wget 安装：Package wget-1.14-18.el7_6.1.x86_64 already installed and latest version

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