> ## Documentation Index
> Fetch the complete documentation index at: https://docs.americ.io.vn/llms.txt
> Use this file to discover all available pages before exploring further.

# User

> User-related commands.

#### List users

```shell theme={null}
# List all users
cat /etc/passwd
cut -d: -f1 /etc/passwd
who
users
# List system users
awk -F':' '$3 < 1000 {print $1}' /etc/passwd
# List normal users
awk -F':' '$3 >= 1000 {print $1}' /etc/passwd
# List all users
getent passwd
# List all groups
getent group
```

#### Create user

```shell theme={null}
sudo adduser americio
#sudo mkhomedir_helper americio
sudo usermod -aG sudo americio
#sudo passwd americio
su americio
```

#### Reset password

```shell theme={null}
sudo passwd $USER_NAME
```

#### User Information

```shell theme={null}
id $USERNAME
# Current logged-in user
id
# Detailed User Info (from /etc/passwd)
getent passwd $USERNAME
# User's groups
groups username
```

#### Rename user group

```shell theme={null}
sudo groupmod -n $NEW_GROUP_NAME $OLD_GROUP_NAME
```

#### Change host name:

* Edit `/etc/hosts`

```shell theme={null}
127.0.0.1       localhost
127.0.1.1       $HOST-NAME
# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost   ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
```

* Change host name

```shell theme={null}
sudo hostnamectl set-hostname $HOST-NAME
```