$ id

uid=1000(kev) gid=1000(kev) groups=1000(kev),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),109(lpadmin),124(sambashare)



$ ls -l /etc/sudoers

-r--r----- 1 root root 723 Jan 31  2012 /etc/sudoers



$ sudo adduser kev root

Adding user `kev' to group `root' ...

Adding user kev to group root

Done.



$ cat /etc/sudoers

cat: /etc/sudoers: Permission denied

After adding myself(kev) to group root, I still cannot read /etc/sudoers.

I don't know why. Thanks for your help.