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SSHKeys

see:

• https://www.tecmint.com/ssh-passwordless-login-using-ssh-keygen-in-5-easy-steps/
• https://unix.stackexchange.com/questions/31071/shell-script-for-logging-into-a-ssh-server
• https://rderik.com/blog/understanding-ssh-keys-and-using-keychain-to-manage-passphrase-on-macos/

my summary:

# generate a key, with or without passphrase
ssh-keygen -t rsa -b 2048 -C " key for rcvn@mac" -f ~/.ssh/id_nas
# put on remove
ssh-copy-id rcvn@nas.local
# then tell the shell to auto add the key, in .profile or equivalent
ssh-add .ssh/id_nas
# and use ssh without typing a password
ssh rcvn@nas.local
# using without ssh-add 
ssh -i ~/.ssh/id_nas nas.local