What do you mean?

    $ ed
    i
    Ed is indeed a good choice for a line editor. We're not talking about line editors, though, but about text editors. Ed is not useful for writing, because it does not have the immediate visual feedback when entering text that even mechanical typewriters have. For that, you need a text editor, and between Vim and Nano, only one behaves like most Unix software developed in the past three decades.
    .
    .s/not useful/useful/g
    p
    Ed is indeed a good choice for a line editor. We're not talking about line editors, though, but about text editors. Ed is useful for writing, because it does not have the immediate visual feedback when entering text that even mechanical typewriters have. For that, you need a text editor, and between Vim and Nano, only one behaves like most Unix software developed in the past three decades.
    .s/does not have/does have/g
    p
    Ed is indeed a good choice for a line editor. We're not talking about line editors, though, but about text editors. Ed is useful for writing, because it does have the immediate visual feedback when entering text that even mechanical typewriters have. For that, you need a text editor, and between Vim and Nano, only one behaves like most Unix software developed in the past three decades.
    w ed_is_useful.txt
    389
    q
    $ cat ed_is_useful.txt 
    Ed is indeed a good choice for a line editor. We're not talking about line editors, though, but about text editors. Ed is useful for writing, because it does have the immediate visual feedback when entering text that even mechanical typewriters have. For that, you need a text editor, and between Vim and Nano, only one behaves like most Unix software developed in the past three decades.
    $