How can I open a file read-only from command line with emacs/vi/vim

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Chapters
00:00 Question
00:33 Accepted answer (Score 52)
01:00 Answer 2 (Score 149)
01:11 Answer 3 (Score 26)
01:39 Answer 4 (Score 10)
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Full question
https://superuser.com/questions/204236/h...

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Tags
#linux #commandline #vim #emacs

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