Sudo without password

sudo visudo  
username ALL=(ALL) NOPASSWD:ALL  

Create SSH keypair

ssh-keygen -t rsa -b 4096 -C "your_email@example.com"  

Add user to group

sudo usermod -aG groupname username  

Finding large files

find / -type f -size +50M  

Find network adapters

ip link show  

Find by port

netstat -ano 1 | findstr 443  

List in use ports

netstat -peanut  

Zip a folder

zip -9 -r ./files.zip ./folder