Linux basics

User and group management

Add user to group

sudo usermod -a -G GROUP_NAME USER_NAME

  • -a append add user to group, otherwise the user will be removed from any groups, not in the list.

  • -G comma-separated list of additional groups to assign the user to.

Networking

IP

List networki adapters

ip link

Enable/disable netwokr adapter

sudo ip link set <ADAPTER_NAME> up/down

Set IP address for adapter

sudo ip addr add <IP_ADDRESS>/<NETMASK> dev <ADAPTER_NAME>