nvim/Q/Once I open a file in read-only mode in vim or nvim, can I flip to edit mode?

• Once I open a file in read-only mode in vim or nvim, can I flip to edit mode?

  • AI Answer

    • AI/Response
      • Short answer: Yes. Run :set noreadonly (short form: :set noro) to remove the read-only flag and allow normal editing and saving.
      • How read-only mode works: Opening with nvim -R file or view file sets vim's internal readonly option on the buffer. The file is still modifiable — you can enter insert mode, but vim warns you first.
      • If you try to insert before clearing the flag: vim prints W10: Warning: Changing a readonly file. Press Enter to dismiss and continue editing. The buffer now has unsaved changes but is still flagged readonly, so :w will refuse. Clear the flag first:
      • vim

        :set noreadonly

      • Then :w saves normally.
      • Toggle shorthand: :set readonly! toggles the flag (readonly → not readonly, or vice versa).
      • If the file's OS permissions also block writing: clearing readonly is not enough — vim will still refuse :w. Use :w! to force (if you have permission), or fix the file permissions externally first.
      • Summary table:

      • Situation	Command
        Clear readonly flag	:set noreadonly or :set noro
        Toggle readonly flag	:set readonly!
        Force-write (permissions allow)	:w!