$ groups simps
wheel audio lp optical video sys network scanner power simps

Permission denied.
Possibly incorrect password, please try again.
On some systems, you need to be in a special group (often: wheel) to use this program.

$ sudo pacman -S sudo
[sudo] password for simps:
warning: sudo-1.8.25.p1-1 is up to date — reinstalling
resolving dependencies…
looking for conflicting packages…

Packages (1) sudo-1.8.25.p1-1

Total Installed Size: 3.11 MiB
Net Upgrade Size: 0.00 MiB

:: Proceed with installation? [Y/n] y
(1/1) checking keys in keyring [###################] 100%
(1/1) checking package integrity [###################] 100%
(1/1) loading package files [###################] 100%
(1/1) checking for file conflicts [###################] 100%
(1/1) checking available disk space [###################] 100%
:: Processing package changes…
(1/1) reinstalling sudo [###################] 100%
:: Running post-transaction hooks…
(1/2) Creating temporary files…
(2/2) Arming ConditionNeedsUpdate...

## sudoers file.
##
## This file MUST be edited with the 'visudo' command as root.
## Failure to use 'visudo' may result in syntax or file permission errors
## that prevent sudo from running.
##
## See the sudoers man page for the details on how to write a sudoers file.
##

##
## Host alias specification
##
## Groups of machines. These may include host names (optionally with wildcards),
## IP addresses, network numbers or netgroups.
# Host_Alias WEBSERVERS = www1, www2, www3

##
## User alias specification
##
## Groups of users. These may consist of user names, uids, Unix groups,
## or netgroups.
# User_Alias ADMINS = millert, dowdy, mikef

##
## Cmnd alias specification
##
## Groups of commands. Often used to group related commands together.
# Cmnd_Alias PROCESSES = /usr/bin/nice, /bin/kill, /usr/bin/renice, \
# /usr/bin/pkill, /usr/bin/top
# Cmnd_Alias REBOOT = /sbin/halt, /sbin/reboot, /sbin/poweroff

##
## Defaults specification
##
## You may wish to keep some of the following environment variables
## when running commands via sudo.
##
## Locale settings
# Defaults env_keep += «LANG LANGUAGE LINGUAS LC_* _XKB_CHARSET»
##
## Run X applications through sudo; HOME is used to find the
## .Xauthority file. Note that other programs use HOME to find
## configuration files and this may lead to privilege escalation!
# Defaults env_keep += «HOME»
##
## X11 resource path settings
# Defaults env_keep += «XAPPLRESDIR XFILESEARCHPATH XUSERFILESEARCHPATH»
##
## Desktop path settings
# Defaults env_keep += «QTDIR KDEDIR»
##
## Allow sudo-run commands to inherit the callers' ConsoleKit session
# Defaults env_keep += «XDG_SESSION_COOKIE»
##
## Uncomment to enable special input methods. Care should be taken as
## this may allow users to subvert the command being run via sudo.
# Defaults env_keep += «XMODIFIERS GTK_IM_MODULE QT_IM_MODULE QT_IM_SWITCHER»
##
## Uncomment to use a hard-coded PATH instead of the user's to find commands
# Defaults secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
##
## Uncomment to send mail if the user does not enter the correct password.
# Defaults mail_badpass
##
## Uncomment to enable logging of a command's output, except for
## sudoreplay and reboot. Use sudoreplay to play back logged sessions.
# Defaults log_output
# Defaults!/usr/bin/sudoreplay !log_output
# Defaults!/usr/local/bin/sudoreplay !log_output
# Defaults!REBOOT !log_output

##
## Runas alias specification
##

##
## User privilege specification
##
root ALL=(ALL) ALL

## Uncomment to allow members of group wheel to execute any command
%wheel ALL=(ALL) ALL

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

## Uncomment to allow members of group sudo to execute any command
# %sudo ALL=(ALL) ALL

## Uncomment to allow any user to run sudo if they know the password
## of the user they are running the command as (root by default).
# Defaults targetpw # Ask for the password of the target user
# ALL ALL=(ALL) ALL # WARNING: only use this together with 'Defaults targetpw'

## Read drop-in files from /etc/sudoers.d
## (the '#' here does not indicate a comment)
#includedir /etc/sudoers.d

simps ALL=(ALL) ALL