sudo

sudo:

su: Switch User

su -l user -c 'COMMAND'

su -l root -c ‘COMMAND’

su -l root

sudo:

ÊÚȨ֮ºó£¬Äܹ»ÈÃijÓû§ÒÔÁíÍâÒ»¸öÓû§µÄÉí·ÝÔËÐÐÃüÁ

ÅäÖÃÎļþ£ºsudoers
  root  ALL=(ALL)   ALL
  %wheel  ALL=(ALL) ALL

  who: ÔËÐÐÃüÁîÕßµÄÉí·Ý£¬user
  where: ͨ¹ýÄÄЩÖ÷»ú£¬host
  (whom)£ºÒÔÄĸöÓû§µÄÉí·Ý, runas
  which: ÔËÐÐÄÄЩÃüÁcommand

  ÅäÖÃÏ
    users   hosts=(runas)   commands

    users: 
      username
      #uid
      user_alias
      %group_name
      %#gid

    host:
      ip
      hostname
      netaddr

    command:
      command name
      directory
      sudoedit

    Alias_Type NAME = item1, item2, ...
      NAME: ±ØÐëʹÓÃÈ«´óд×Öĸ£»
      Alias_Type: 
        User_Alias
        Host_Alias
        Runas_Alias
        Cmnd_Alias

  Cmnd_Alias USERADMINCMNDS = /usr/sbin/useradd, /usr/sbin/usermod, /usr/bin/passwd [a-z]*, !/usr/bin/passwd root

# sudo [-u user] COMMAND 
  -u user: ĬÈÏΪroot; 
  -k: Çå³ý´ËÇ°¼Ç¼Óû§ÃÜÂ룻