linux 普通用户切换成root免密码

[root@ok ~]# vim /etc/pam.d/su

下面是/etc/pam.d/su文件的内容

   #%PAM-1.0
   auth            sufficient      pam_rootok.so
   # Uncomment the following line to implicitly trust users in the "wheel" group.
   #auth           sufficient      pam_wheel.so trust use_uid
   # Uncomment the following line to require a user to be in the "wheel" group.
   #auth           required        pam_wheel.so use_uid
   auth            include         system-auth
   account         sufficient      pam_succeed_if.so uid =  use_uid quiet
   account         include         system-auth
  password        include         system-auth
  session         include         system-auth
  session         optional        pam_xauth.so
将第４行的#号去掉，然后将登陆用户加入 wheel组
[root@ok ok]# usermod -G wheel ok
[ok@ok ~]$ su
[root@ok ok]#
su直接切换成root