linux常用命令和经验总结

1、将字体变大

Alt+P

2、如何将光标由粗线（块）变成竖线

在Xshell中，查看属性，然后修改即可。

3、linux  在执行这个命令yum -y install vim-enhanced 出现

Loaded plugins: fastestmirror

Loading mirror speeds from cached hostfile

解决方案：

4、 当我们刚使用一个新的linux的时候，会有yum命令的使用和wget命令，但是会出现报错，这是因为没有下载到本地

问题：

  

   

    

     

    
    

     

      curl
      #6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

       One of the configured repositories failed (Unknown),
     
    
   

    

     

    
    

     

       and yum doesn't have enough cached data to continue. At this point the only
     
    
   

    

     

    
    

     

       safe thing yum can 
      do 
      is fail. There 
      are a few ways 
      to 
      work 
      "fix" this:
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
     
      1. Contact the upstream 
      for the repository 
      and 
      get them 
      to fix the problem.
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
     
      2. Reconfigure the baseurl/etc. 
      for the repository, 
      to point 
      to a working
     
    
   

    

     

    
    

     

              upstream. This 
      is most often useful 
      if you 
      are 
      using a newer
     
    
   

    

     

    
    

     

              distribution 
      release 
      than 
      is supported 
      by the repository (
      and the
     
    
   

    

     

    
    

     

              packages 
      for the previous distribution 
      release still 
      work).
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
     
      3. Run the command 
      with the repository temporarily disabled
     
    
   

    

     

    
    

     

                  yum 
      --disablerepo=<repoid> ...
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
     
      4. 
      Disable the repository permanently, so yum won
      't use it by default. Yum
     
    
   

    

     

    
    

     

       will then just ignore the repository until you permanently enable it
     
    
   

    

     

    
    

     

       again or use --enablerepo for temporary usage:
     
    
   

    

     

    
    

     

      
     
    
   

    

     

    
    

     

       yum-config-manager --disable <repoid>
     
    
   

    

     

    
    

     

       or
     
    
   

    

     

    
    

     

       subscription-manager repos --disable=<repoid>
     
    
   

    

     

    
    

     

      
     
    
   

    

     

    
    

     

       5. Configure the failing repository to be skipped, if it is unavailable.
     
    
   

    

     

    
    

     

       Note that yum will try to contact the repo. when it runs most commands,
     
    
   

    

     

    
    

     

       so will have to try and fail each time (and thus. yum will be be much
     
    
   

    

     

    
    

     

       slower). If it is a very temporary problem though, this is often a nice
     
    
   

    

     

    
    

     

       compromise:
     
    
   

    

     

    
    

     

      
     
    
   

    

     

    
    

     

       yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true
     
    
   

    

     

    
    

     

      
     
    
   

    

     

    
    

     

      Cannot find a valid baseurl for repo: base/7/x86_64
     
    
   

    

     

    
    

     

      
     
    
  

解决方案：

vi /etc/resolv.conf

在上面文件中添加下面一行的命令就可以。

nameserver 114.114.114.114

 这是国内的DNS服务器系统，谷歌的可以使用8.8.8.8

修改完成后执行service network restart进行重启，试一下yum update命令，就可以了。

5、

问题；

Error: NetworkManager is not running.

 解决方案：

systemctl restart NetworkManager

6、在我们安装mysql的时候会出现以下问题

  

   

    

     

    
    

     

      [root@quzhujianju-ykt-beifen1 mysql]# rpm -ivh mysql-community-
      server
      -5.7
      .24
      -1.el7.x86_64.rpm
     
    
   

    

     

    
    

     

      warning: mysql-community-
      server
      -5.7
      .24
      -1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 
      5072e1f5: NOKEY
     
    
   

    

     

    
    

     

      error: Failed dependencies:
     
    
   

    

     

    
    

     

      	perl(Getopt::Long) 
      is needed by mysql-community-
      server
      -5.7
      .24
      -1.el7.x86_64
     
    
  

解决方案：

这是由于yum安装了旧版本的GPG keys造成的，所以我们只需要在命令的后面加上 --force --nodeps