How do I format long lines in a file so that each line contains less

than ‘n’ characters? You can set the ‘textwidth’ option to control the number of characters that can be present in a line. For example, to set the maximum width of a line to 70 characters, you can use the following command:

    set textwidth=70

Now to break the long lines in a file to the length defined by the ‘textwidth’ option, you can use

    :g/./normal gqq