ssh basics - authorized_keys

mkdir ~/.ssh
Set the right permissions:

chmod 700 ~/.ssh
Create the authorized_keys file:

touch ~/.ssh/authorized_keys
Set the right permissions:
**OR**
vi ~/.ssh/authorized_keys

chmod 600 ~/.ssh/authorized_keys

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mkdir ~/.ssh; chmod 700 ~/.ssh ; touch ~/.ssh/authorized_keys ; chmod 600 ~/.ssh/authorized_keys ; vi ~/.ssh/authorized_keys