Linux基本操作命令_ritto

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# 服务器信息查看
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1.查看版本，内核
 cat /etc/issue

2.查看cpu,mem
grep "model name" /proc/cpuinfo
grep MemTotal /proc/meminfo
free

3. 内存的插槽数,已经使用多少插槽.每条内存多大，已使用内存多大 
    dmidecode | grep -P -A 5 "Memory\s+Device" | grep Size | grep -v Range

    Size: 2048 MB
    Size: No Module Installed
    Size: No Module Installed
    Size: No Module Installed

4. 支持的最大内存容量 
   dmidecode | grep -P 'Maximum\s+Capacity'
   Maximum Capacity: 64 GB

5. 查看内存的频率
dmidecode | grep -A16 "Memory Device"
dmidecode | grep -A16 "Memory Device" | grep 'Speed'

6.查看操作系统位数
getconf LONG_BIT

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# 基本设置
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# 设置主机名
  vi /etc/sysconfig/network
  HOSTNAME=centos
  reboot system...

# ifconfig eth0 192.168.4.222 netmask 255.255.255.0
# ifconfig eth0:0 10.0.0.1 netmask 255.0.0.0
# ifconfig eth0 down
# ifconfig eth0 on

# 更改网卡MAC地址
ifconfig eth0 hw ether 00:37:A6:C4:68:E3

# route命令设置网关
route add default gw 192.168.4.3
route del default gw 192.168.4.1

# 查看端口信息
netstat -atn

# 查看路由表
netstat -r

# 查看网络接口状态
netstat -i

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# 增加环境变量

echo "export PATH=$PATH:/usr/local/mysql/bin" >> /etc/profile  //永久修改的
source /etc/profile 

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