make SSH login once

ssh-login-once.md

install keychain

sudo apt update
sudo apt install -y keychain

add below to shell rc file
you can change from id_rsa to another private key file name

• bash

  echo "eval \"\$(keychain --agents ssh --eval id_rsa -q)\"" >> ~/.bashrc

• zsh

  echo "eval \"\$(keychain --agents ssh --eval id_rsa -q)\"" >> ~/.zshrc