Bash extract user for a particular host from ssh config file

You can use ssh configuration test mode to parse the configuration file and return you the expected value:

ssh -G hostname | grep "^user "

This should work since openssh-6.8.

As per 123's comment above:

var=$(awk '/^Host bloo$/{x=1}x&&/User/{print $2;exit}' ssh.conf)

That will assign value ABCDEF to var.

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