my-mnag0:~$ cd /etc
my-mnag0:/etc$ visudo
-sh: visudo: command not found
my-mnag0:/etc$ vi sudoers

my9849
my9849@my-mnag0:~> sudo su -
>>> sudoers file: syntax error, line 17 <<<
sudo: parse error in /etc/sudoers near line 17

my-mnag0:~ # visudo
Warning: undeclared Cmnd_Alias `SUDO' referenced near line 39

# 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.
#

# Host alias specification

Host_Alias    LAN = my-mnag.os.itelligence.com.my

# User alias specification

User_Alias    GHELPDESK = test

# Cmnd alias specification

Cmnd_Alias    SUDO = visudo

# Defaults specification

Defaults    log_year, logfile=/var/log/sudo.log

# prevent environment variables from influencing programs in an
# unexpected or harmful way (CVE-2005-2959, CVE-2005-4158,
# CVE-2006-0151)
Defaults always_set_home
Defaults env_reset

# In the default (unconfigured) configuration, sudo asks for the root password.
# This allows use of an ordinary user account for administration of a freshly
# installed system. When configuring sudo, delete the two
# following lines:
#Defaults targetpw    # ask for the password of the target user i.e. root
#ALL ALL=(ALL) ALL # WARNING! Only use this together with 'Defaults targetpw'!

# Runas alias specification

GHELPDESK     LAN = SUDO

# User privilege specification
root    ALL=(ALL) ALL
%wheel  ALL=(ALL)       ALL
%infra ALL=(ALL)        ALL

# Same thing without a password
# %wheel        ALL=(ALL)       NOPASSWD: ALL

# Samples
# %users  ALL=/sbin/mount /cdrom,/sbin/umount /cdrom
# %users  localhost=/sbin/shutdown -h now