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Fix .ssh/known_hosts path expansion. · b6875b3b
In particular, do not rely on the $USER environment variable always existing. tmux for example seems to clear it, causing lots of invalid messages: "previous known host file not found" This broke in commit 80fd22dc, but instead of reverting that commit, we now fall back to expanding just ~ when $USER is not set.
Heikki Hokkanen committed