To install Sudo:
pacman -S sudo
Enabling sudo for Users
To add a user as a sudo user (a "sudoer"), type "visudo" as root. This will open the file /etc/sudoers in a special session of vi. If you don't know how to use vi, you can type for example the following:
(Do not edit /etc/sudoers directly with an editor). To give the user full root privileges when he/she precedes a command with "sudo", add the following line:
USER_NAME ALL=(ALL) ALL
where USER_NAME is the username of the individual.
Enabling Tab-Completion for sudo Users
Tab-completion, by default, will not work when a user is initially added to the sudoers file. For example, normally johndoe only has to type:
and the shell will complete out the command for him as:
If, however, johndoe is added to the sudoers file and he types:
the shell will do nothing.
If you use programmable completion for bash you should comment out the following lines in /etc/bash_completion:
# user commands see only users complete -u su usermod userdel passwd chage write chfn groups slay w
# group commands see only groups [ -n "$bash205" ] && complete -g groupmod groupdel newgrp 2>/dev/null
Otherwise add the following to your ~/.bashrc (only if you did not modify bash_completion as it overwrites the settings for sudo):
complete -cf sudo
You might want to change the default timeout before the password expires. This is simply done by adding following to /etc/sudoers (visudo):
This is how it may look like:
Where the user foo's password expires if it is unused for over 20 minutes.
Note: If you would like sudo to always ask for password, just set the timeout to zero.
If you have a lot of environment variables, or you export your proxy settings via export http_proxy="..", when using sudo these variables do not get passed to the root account unless you run sudo with the -E option.
sudo -E pacman -Sy
Because of this you may wish to add an alias in ~/.bashrc:
alias sudo="sudo -E"
Another way of fixing this would be to add in /etc/sudoers:
If you want to just pass *_proxy variables, add the following:
Defaults env_keep += "ftp_proxy http_proxy https_proxy no_proxy"
To summarize, the following setup will satisfy most individuals, where USER_NAME is the individual's username:
1. pacman -S sudo 2. add "USER_NAME ALL=(ALL) ALL" to /etc/sudoers 3. add "complete -cf sudo" to /home/USER_NAME/.bashrc
There is a way of telling sudo to insult you every time you type the wrong password, instead just printing the default "wrong password" message. To enable this Easter-egg:
# sudo visudo
Find the Defaults line (approx. line 18) and append "insults" after a comma to anything that may be here. The final might look like this:
#Defaults specification Defaults insults
Note: to try if it worked right, type sudo -K to end you current session a let sudo ask for the password again
If you need sudo for example for makepkg -s, but don't want a security risk you can configure sudo to ask for the root password instead of the user password. Add "rootpw" to the Defaults line: