gnu linux users

Table of Contents:

• users and groups
  • add users
    • ubuntu
    • centos
  • modify users
  • delete users

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users and groups

add users

• create user with home folder and login sudo useradd -m username -p PASSWORD
• add user to sudo group on ubuntu

ubuntu

usermod -aG sudo arvin

centos

usermod -aG wheel arvin

modify users

• set expiry time for user

sudo usermod --expiredate 1 arvin

• lock user password ( disable ssh )

sudo passwd -l arvin

• enable user password

sudo passwd -u training

• set expiry time for user password

sudo passwd -e  2013-05-31 arvin

• enable root user

su -
passwd

delete users

• r option removes home directory

userdel -r arvin