Good post. You could save one step doing just

‘’’

# inet 192.168.1.19 0xffffff00 > /etc/hostname.urtwn0

‘’’

And the:

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$ doas echo 192.168.1.1 >> /etc/mygate

‘’’

Would be better like:

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$ doas echo 192.168.1.1 > /etc/mygate

‘’’

Just to make sure you don’t end with a multiple lines /etc/mygate