Issue #12695 has been reported by Mrten Svantesson.

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Feature #12695: File.expand_path should resolve ~/ using /etc/passwd when HOME is not set
https://bugs.ruby-lang.org/issues/12695

* Author: Mrten Svantesson
* Status: Open
* Priority: Normal
* Assignee: 
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I would expect a call like File.expand_path('~/.ssh/known_hosts') to work even though HOME is not set.

A reason this is important to fix is that libraries (in my use case Net::SSH) do calls like File.expand_path('~/.ssh/known_hosts'), but this will often fail when the code is run in a unix service, since HOME often isn't set then.
I considered reporting this as a bug, but the current behaviour is actually documented.




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