**{{ :the_linux_command_line_-_19.01.pdf |The Linux Command Line (ebook - authoritative)}}**

==== LINUX REFERENCE ====
==== Set a static IP ====
1. Install network-manager if it’s not already installed:
  sudo apt install -y network-manager
2. Get the current IP address and the name of the Ethernet interface
  ip a
3. Ping the desired static IP address to make sure some other machine isn’t already using it. (Command below assumes a desired IP address of 10.10.10.111)
  ping -c 8 10.1.1.111
4. If a machine responds to the pings, find it, and shut it down (if it’s using  back with 

 (Assuming an interface name of enp1s0)

==== Setting a Static IP Address on Ubuntu Server ====
Ubuntu Server 22.04/24.04LTS uses a utility called ‘netplan’ for networking. To set a static IP we need to edit the config file.
<code>
sudo nano /etc/netplan/0[hit tab to autocomplete whatever the filename is]
</code> 
The static IP config should look similar to this:
<code>
network:
  renderer: networkd
  ethernets:
    eth0:
      addresses:
        - 10.1.11.88/24
      nameservers:
        addresses: [1.1.1.2,9.9.9.9,8.8.8.8]
      routes:
        - to: default
          via: 10.1.1.1
  version: 2
</code> 
Save the file and exit

Run the following command to set the permissions for the config file:
<code>
sudo chmod 0600 /etc/netplan/00-installer-config.yaml
</code> 
To apply the changes run the following command:
<code> 
sudo netplan apply
</code> 
To confirm the settings, run the following to see the current IP:
<code>
ip addr show eth0
</code>
Run the following to see the default gateway:
<code>
ip route show
</code>
Run the following command to see the DNS servers being used:
<code>
resolvectl status
</code> 

==== File/directory permissions/ownership ====
{{ :chmod-chown_-_file_directory_permissions_ownership.pdf |chmod/chown}}