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Fernando Vásquez is an electronics engineer and software developer currently based in the world. He occasionally blogs about Python and Android programming.

Linux User Management

linux user
Published on 23 Jun 2020
  • list users
sudo cat /etc/shadow
sudo users                  # connected ones
cat /etc/passwd | grep ftp  # FTP users
  • create users
sudo useradd -s /bin/bash -d /home/__USER__ -m __USER__
sudo passwd __USER__
  • Add to sudoers with sudo visudo then update user:
__USER__ ALL=(ALL:ALL) ALL
<HOSTs>=(<T>:<COMMAND>)
  • or just:
sudo adduser __USER__ sudo
  • group management
groupadd -r __GROUP__           # create new group

gpasswd -a __USER__ __GROUP__   # add user to group
gpasswd -d __USER__ __GROUP__   # delete user to group
gpasswd -M u1,u2,.. __GROUP__   # set memebers of a groups

usermod -a -G __GROUP__ __USER__
  • activar y desactivar root en ubuntu
sudo passwd root
sudo passwd -l root
  • set default shell to user
chsh -s /bin/bash username
  • SSH login without password
ssh-keygen -t rsa                            # generate key in your PC
scp ~/.ssh/id_rsa.pub ~/.ssh/authorized_keys # copy public key to authorized_keys in the server
  • disable password authentication for specific user
sudo vim /etc/ssh/sshd_config
Match user __USER__
PasswordAuthentication no

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