bash sudo 运行指定function

问题: bash function 中有部分需要sudo运行，如何定义
参考:https://serverfault.com/questions/177699/how-can-i-execute-a-bash-function-with-sudo?newreg=de7619fc54fe4547bd3e8af0647b860d

  1 #!/bin/bash                                                                                                                               
  2 #function run with sudo  
  3  
  4 function Hello() {
  5   echo "Heeeeeello, $1"
  6   whoami
  7   }
  8  
  9 hello(){
 10     echo "hi,$1"
 11 }
 12  
 13 hello nosudo
 14 sudo_password="sudo_password"
 15 echo "${sudo_password}"|sudo -S su root -c "$(declare -f Hello); Hello start"

$ help declare 

 Options:
      -f restrict action or display to function names and definitions