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我明白这意味着强制做某事。

这样做时$ vim -R file我进入read-only模式，但这仅作为预防模式起作用

-R  Readonly mode.  The 'readonly' option will be set for all the
    files being edited.  You can still edit the buffer, but will
    be prevented from accidentally overwriting a file.  If you
    forgot that you are in View mode and did make some changes,
    you can overwrite a file by adding an exclamation mark to
    the Ex command, as in ":w!".  The 'readonly' option can be
    reset with ":set …