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I change my /private/etc permissions to "eveybody can read and write", and applied this permission to all sub-folders and files. (something ****** to do)After that, when I use "sudo" command something went wrong:sudo: unable to stat /etc/sudoers: Permission deniedsudo: no valid sudoers sources found, quittingsudo: unable to initialize policy pluginAlso, I make a change to my "sudoer" file when trying to solve the problem.Here is its content:----------------------------------------------------------------------------------------------------------------------------------------# # Sample /etc/sudoers file. # # This file MUST be edited with the 'visudo' command as root. # # See the sudoers man page for the details on how to write a sudoers file. ## # Override built-in defaults ## Defaults env_reset Defaults env_keep += "BLOCKSIZE" Defaults env_keep += "COLORFGBG COLORTERM" Defaults env_keep += "__CF_USER_TEXT_ENCODING" Defaults env_keep += "CHARSET LANG LANGUAGE LC_ALL LC_COLLATE LC_CTYPE" Defaults env_keep += "LC_MESSAGES LC_MONETARY LC_NUMERIC LC_TIME" Defaults env_keep += "LINES COLUMNS" Defaults env_keep += "LSCOLORS" Defaults env_keep += "SSH_AUTH_SOCK" Defaults env_keep += "TZ" Defaults env_keep += "DISPLAY XAUTHORIZATION XAUTHORITY" Defaults env_keep += "EDITOR VISUAL" Defaults env_keep += "HOME MAIL" Defaults lecture_file = "/etc/sudo_lecture" ## # User alias specification ## # User_Alias FULLTIMERS = millert, mikef, dowdy ## # Runas alias specification ## # Runas_Alias OP = root, operator ## # Host alias specification ## # Host_Alias CUNETS = 128.138.0.0/255.255.0.0 # Host_Alias CSNETS = 128.138.243.0, 128.138.204.0/24, 128.138.242.0 # Host_Alias SERVERS = master, mail, www, ns # Host_Alias CDROM = orion, perseus, hercules ## # Cmnd alias specification ## # Cmnd_Alias PAGERS = /usr/bin/more, /usr/bin/pg, /usr/bin/less ## # User specification ## # root and users in group wheel can run anything on any machine as any user root ALL = (ALL) ALL %admin ALL = (ALL) ALL ## Read drop-in files from /private/etc/sudoers.d ## (the '#' here does not indicate a comment) #includedir /private/etc/sudoers.d [root@localhost ~]# echo 'username ALL=(ALL) ALL' >> /etc/sudoer [root@test ~]# visudo jin ALL=NOPASSWD: ALL Jin ALL = (ALL) ALL %wheel ALL=(ALL) NOPASSWD: ALL #includedir /etc/sudoers.dCan anyone help me?Thank you.

I have a list of bad blocks (fsck_hfs -S), and I want to add it to the badblock section of hfs+ filesystem. I do not know how to write a program to do that, so is there an existing program to do it?