Git: How to update/checkout a single file from remote origin master?

Question

The scenario:

1. I make some changes in a single file locally and run git add, git commit and git push
2. The file is

Answer 1

With Git 2.23 (August 2019) and the new (still experimental) command git restore, seen in "How to reset all files from working directory but not from staging area?", that would be:

git fetch
git restore -s origin/master -- path/to/file

The idea is: git restore only deals with files, not files and branches as git checkout does.
See "Confused by git checkout": that is where git switch comes in)

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codersam adds in the comments:

in my case I wanted to get the data from my upstream (from which I forked).
So just changed to:

git restore -s upstream/master -- path/to/file