nixCraft

User_Alias USERS=sarkar,redhat
Cmnd_Alias USERS=/sbin/fdisk,/sbin/ifconfig
USERS ALL=USERS

I gave the following commands in /etc/sudoers. When I tried to save the sudoers file..

its telling that Host_Alias USERS not found.
User_Alias not correct..

Please let me knw if any mistake is there in the below /etc/sudoers file.. They are given in bold format..

## Sudoers allows particular users to run various commands as
## the root user, without needing the root password.

##
## Examples are provided at the bottom of the file for collections
## of related commands, which can then be delegated out to particular
## users or groups.

##
## This file must be edited with the 'visudo' command.


## Host Aliases
## Groups of machines. You may prefer to use hostnames (perhap using

## wildcards for entire domain or IP addresses instead.

# Host_Alias FILESERVERS = fs1, fs2
# Host_Alias MAILSERVERS = smtp, smtp2
## User Aliases
## These aren't often necessary, as you can use regular groups

## (ie, from files, LDAP, NIS, etc) in this file - just use %groupname
## rather than
USERALIAS
# User_Alias ADMINS = jsmith, mikem

User_Alias USERS=sarkar,ram,redhat

## Command Aliases
## These are groups of related commands...

## Networking
Cmnd_Alias NETWORKING = /sbin/route, /sbin/ifconfig, /bin/ping, /sbin/dhclient, /usr/bin/net, /sbin/iptables, /usr/bin/rfcomm, /usr/bin/wvdial, /sbin/iwconfig, /sbin/mii-tool

## Installation and management of software
Cmnd_Alias SOFTWARE = /bin/rpm, /usr/bin/up2date, /usr/bin/yum
Cmnd_Alias USERS=/sbin/fdisk,/usr/sbin/updatedb,/sbin/chkconfig

## Services
Cmnd_Alias SERVICES = /sbin/service, /sbin/chkconfig
## Updating the locate database
Cmnd_Alias LOCATE = /usr/sbin/updatedb

## Storage
Cmnd_Alias STORAGE = /sbin/fdisk, /sbin/sfdisk, /sbin/parted, /sbin/partprobe, /bin/mount, /bin/umount

## Delegating permissions
Cmnd_Alias DELEGATING = /usr/sbin/visudo, /bin/chown, /bin/chmod, /bin/chgrp
## Processes
Cmnd_Alias PROCESSES = /bin/nice, /bin/kill, /usr/bin/kill, /usr/bin/killall

## Drivers
Cmnd_Alias DRIVERS = /sbin/modprobe
# Defaults specification
#
# Disable "ssh hostname sudo <cmd>", because it will show the password in clear.

# You have to run "ssh -t hostname sudo <cmd>".
#
Defaults requiretty
Defaults env_reset
Defaults env_keep = "COLORS DISPLAY HOSTNAME HISTSIZE INPUTRC KDEDIR \
LS_COLORS MAIL PS1 PS2 QTDIR USERNAME \
LANG LC_ADDRESS LC_CTYPE LC_COLLATE LC_IDENTIFICATION \
LC_MEASUREMENT LC_MESSAGES LC_MONETARY LC_NAME LC_NUMERIC \
LC_PAPER LC_TELEPHONE LC_TIME LC_ALL LANGUAGE LINGUAS \
_XKB_CHARSET XAUTHORITY"
## Next comes the main part: which users can run what software on

## which machines (the sudoers file can be shared between multiple
## system.

## Syntax:
##

## user MACHINE=COMMANDS
##

## The COMMANDS section may have other options added to it.
##

## Allow root to run any commands anywhere
root ALL=(ALL) ALL

## Allows members of the 'sys' group to run networking, software,

## service management apps and more.

%sys ALL = NETWORKING, SOFTWARE, SERVICES, STORAGE, DELEGATING, PROCESSES, LOCATE, DRIVERS
## Allows people in group wheel to run all commands

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

# %wheel ALL=(ALL) NOPASSWD: ALL

## Allows members of the users group to mount and unmount the
## cdrom as root

# %users ALL=/sbin/mount /mnt/cdrom, /sbin/umount /mnt/cdrom

## Allows members of the users group to shutdown this system

# %users localhost=/sbin/shutdown -h now
USERS ALL=USERS

User_Alias SARKAR = sarkar
User_Alias REDHAT =redhat

Cmnd_Alias FDISK = /sbin/fdisk
Cmnd_Alias IFCONFIG = /sbin/ifconfig

SARKAR ALL =FDISK,IFCONFIG
REDHAT ALL =FDISK,IFCONFIG

Please try this i have this and has been suceeded.

Shrikumar

__________________
Shrikumar