Editor command summary.

Opening, Writing, and Closing Files

    vi file        open file named file (UNIX shell command)

    :w            write changes into default file

    :w file        write changes into file named file

    :q            quit vi

    :wq        write changes into file and quit vi

    :q!        quit without writing changes into file

Inserting Text (vi command mode)

    a    add text to the right of the current cursor location

    i    insert text to the left of the curosr

    O    Open up a new line above the current line

    o    open up a new line below the current line

    R    Replace (type over) text

    ESC    return to command mode

Correcting Mistakes (vi command mode)

    x        delete one character

    dd        delete entire line

    ndd        delete n lines

    u            "undo" most recent change

    U            "Undo" all changes on current line

Check Spelling (UNIX shell command)

    spell file        list misspelled words found in file

Searching (vi command mode)

    /word        search forward for the first occurrence of word

    /                continue search for the next occurrence of word

    ?word        search backward for the first occurrence of word

    ?                continue search backward for the next occurrence of word

Setting Line Number (vi command mode)

    :set nu        set line numbers on the screen

    :set nonu    remove line numbers

Yanking and Putting (vi command mode) 

    "knyy        yank (copy) n lines into buffer "k

    "kp            put the contents of buffer "k below the current line

Substituting Text Globally (vi command mode)

     %s/old/new/g      replace old by new everywhere in the file

Editing Another File (vi command mode)

    :e file         edit file

Selecting an Editor for Command-Line Editing (UNIX shell commands)

VISUAL=vi        select vi (for ksh)

set -o vi                select vi (for bash)