# passwd root
# echo "123456" | passwd --stdin root
# passwd --stdin root <<< "123456"
# passwd --stdin root < <(echo "123456")
交互式创建用户
cat create_user.sh
##################################
#！/bin/bash
read -p "请输入用户名：" user
stty -echo
read -p "请输入密码：" passwd1
echo ""
read -p "请再次输入密码：" passwd2
stty echo
echo ""
if [ "$passwd1" = "$passwd2" ]; then
useradd "$user" &>/dev/null
echo "$passwd2" | passwd --stdin "$user" &>/dev/null
else
echo "两次输入的密码不一样，程序退出！"
exit
fi
##################################
