#sudoer

[arthurtoday]

Ubuntu 快速將使用者設成 Sudoer

用 adduser 就可以把使用者變成 sudoer

[mikewittmer-blog]

How To Add A User To The Sudoers File In this quick video, I show how to add a user to the Sudoers file in Debian Wheezy (Linux).

[nraj]

*nix - User and Group management

List all users

cat /etc/passwd

Add a new user

useradd testuser

Modify testuser - adding to another group - apache

usermod -a -G apache testuser

Get a new password for testuser

passwd testuser

Add testuser to sudoer by modifying sudoers file like so:

vi /etc/sudoers

testuser ALL=(ALL)       NOPASSWD: ALL

Delete user

userdel testuser

List all groups

cat /etc/group

Enumerate all groups of a user

groups testuser

This would list all the groups of logged-in user

groups  

Note: If running some commands gives error - Command not found, then try

 /usr/sbin/user* for user* commands

/usr/bin/groups for groups command

If that also doesn't work, find out the location of command like so: 

           whereis x OR which x

Update $PATH with the command path for future invocations.