點點滴滴 linux 命令（I）

查看當前操作系統版本信息：

[root@bearPC sbin]# cat /proc/version
Linux version 3.10.0-957.5.1.el7.x86_64 ([email protected]) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-36) (GCC) ) #

查看內核信息：

[root@bearPC sbin]# uname -a
Linux bearPC 3.10.0-957.5.1.el7.x86_64 #1 SMP Fri Feb 1 14:54:57 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

查看版本當前操作系統發行信息：

[root@bearPC sbin]# cat /etc/centos-release
CentOS Linux release 7.6.1810 (Core) 

更新（同步）時間。需要安裝 ntpdate

[root@master /]# yum install ntpdate
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.163.com
 * extras: mirrors.163.com
 * updates: mirrors.163.com
base                                                                                                          | 3.6 kB  00:00:00     
extras                                                                                                        | 2.9 kB  00:00:00     
mysql-connectors-community                                                                                    | 2.5 kB  00:00:00     
mysql-tools-community                                                                                         | 2.5 kB  00:00:02     
mysql57-community                                                                                             | 2.5 kB  00:00:00     
updates                                                                                                       | 2.9 kB  00:00:00     
Resolving Dependencies
--> Running transaction check
---> Package ntpdate.x86_64 0:4.2.6p5-29.el7.centos will be installed
--> Finished Dependency Resolution

Dependencies Resolved

=====================================================================================================================================
 Package                      Arch                        Version                                    Repository                 Size
=====================================================================================================================================
Installing:
 ntpdate                      x86_64                      4.2.6p5-29.el7.centos                      base                       86 k

Transaction Summary
=====================================================================================================================================
Install  1 Package

Total download size: 86 k
Installed size: 121 k
Is this ok [y/d/N]: y
Downloading packages:
ntpdate-4.2.6p5-29.el7.centos.x86_64.rpm                                                                      |  86 kB  00:00:01     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : ntpdate-4.2.6p5-29.el7.centos.x86_64                                                                              1/1 
  Verifying  : ntpdate-4.2.6p5-29.el7.centos.x86_64                                                                              1/1 

Installed:
  ntpdate.x86_64 0:4.2.6p5-29.el7.centos                                                                                             

Complete!

同步時間

[root@master /]# ntpdate time.windows.com
23 Nov 23:35:56 ntpdate[2146]: step time server 20.189.79.72 offset -28799.674890 sec