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