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How to change file permission from within vi

I sometimes open a read-only file in vi, forgetting to do chmod +w before opening it. Is there way to change the file from within vi?

Something like !r chmod +w [filename]?

Is there a shortcut to refer to the currently open file without spelling it's long name?

Solution

  • Just use 

    :!chmod +w %

    in command mode. % will be replaced by the current file name.