nslookup dnsutils
yum install bind-utils
# apt-get update
# apt-get install dnsutils
安装iftop
1 yum install epel-release
2yum install iftop
安装locate
yum install mlocate
yum install net-tools*
yum install bridge-utils*
useradd
yum install shadow-utils
alpine linux包查询https://pkgs.alpinelinux.org/contents?file=useradd&path=&name=&branch=v3.6&arch=x86_64
apk update && apk add shadow
