El archivo sudoers también permite especificar excepciones, aqui tienen
un ejemplo
Host_Alias SERVER = 192.168.0.1, 192.168.0.2
User_Alias ADM = usuario1
User_Alias PWR = usuario2, usuario3
User_Alias USR = usuario2
Cmnd_Alias SHUTDOWN = /sbin/shutdown
Cmnd_Alias HALT = /sbin/halt
Cmnd_Alias REBOOT = /sbin/reboot
Cmnd_Alias IFUPDOWN = /sbin/ifup [a-z]*([0-9])?, /sbin/ifdown
[a-z]*([0-9])?
Cmnd_Alias SERVICES = /sbin/service network *, /sbin/service
iptables *, /sbin/service httpd *, /sbin/service postfix *
Cmnd_Alias PASS = /usr/bin/passwd *, !/usr/bin/passwd root
Cmnd_Alias FDISK = /sbin/fdisk *, ! /sbin/fdisk /dev/sda(/[0-2])?
Cmnd_Alias MOUNT = /sbin/mount *, /sbin/umount *, !/sbin/umount /
Cmnd_Alias USERMGR = /usr/sbin/useradd, /usr/sbin/usermod,
/usr/sbin/userdel, !/usr/sbin/usermod root
Cmnd_Alias OTHER = /usr/bin/less *, /bin/bash
ADM SERVER = ALL
USR SERVER = FDISK, MOUNT, IFUPDOWN, SERVICES, PASS, USERMGR, OTHER
PWR SERVER = NOPASSWD: SHUTDOWN, HALT, REBOOT
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