Set the default user and key for a host when using SSH

Trick copyright: Bash-Oneliner <https://github.com/onceupon/Bash-Oneliner>

# add the following to ~/.ssh/config
Host myserver
  User myuser
  IdentityFile ~/path/to/mykey.pem

# Next, you could run "ssh myserver" instead of "ssh -i ~/path/to/mykey.pem myuser@myserver"

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