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Linux常用命令-28：ifconfig
source link: https://xugaoxiang.com/2022/06/07/linux-cmds-28-ifconfig/
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ifconfig 命令用于查看和配置网络参数。使用 ifconfig 命令配置的信息，在网卡重启或机器重启后，配置就不存在。要想永远保存，就需要修改网卡的配置文件了。
语法格式：ifconfig [参数]
常用参数：
# 显示全部网络信息
ifconfig
# 查看指定网卡
ifconfig enp0s25
# 关闭网卡eth0
ifconfig eth0 down
# 启动网卡eth0
ifconfig eth0 up
# 设置ip地址
ifconfig eth0 192.168.1.100
# 设置ip和子网掩码
ifconfig eth0 192.168.1.100 netmask 255.255.255.0Recommend
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