pre:

     a                Add text after the cursor.
     A                Add text to the end of the current line.
     i                Insert text at the cursor.
     I                Insert text at the beginning of the current line.
     o                Open a new line below the current line and add text.
     O                Open a new line above the current line and add text.
     S                Substitute the letter underneath the cursor with letter you type.
     S or c           Delete the current line and substitute it with text you type.
     R or C           Replace current text with text you type.

     x                Delete the letter beneath the cursor.
     dw               Delete the letter beneath the cursor and the rest of the word.
   # dw               Delete the following number of words, including the current word.
     D                Delete from the cursor to the end of the line.
     dd               Delete the current line.
   # dd               Delete the following number of lines, including the current line.
     yy               Copy or "yank" the current line.
   # yy               Copy or "yank" the following number of lines, including the current line.
     p                Paste the current copied or deleted letters, words, or lines after the cursor.
     J                Join the next line with the current line (erases a carriage return).
     u                Undo the last edit.
     .                Redo the last editing command.

     j                Move down to the next line.
     k                Move up to the previous line.
     h                Move backward by letter.
     l                Move forward by letter.
     w                Move forward by word.
     b                Move backward by word.
     e                Move forward to the end of a word.
CTRL+F                Move forward to next screen.
CTRL+B                Move backward to previous screen.
CTRL+D                Move forward one-half of a screen.
     G                Move to the end of the file.
   # G                Move to the specified line number in the file.
     $                Move to the end of the current line.
     0                Move to the beginning of the current line.

     /                Search for a specified word.
     n                Search for next occurrence of specified word.
     N                Search for previous occurrence of specified word.

    :wq or ZZ         Save and quit out of the file.
    :w                Save the current file without quitting.
    :q                Quit if no edits have occurred.
    :q!               Quit without saving edits.

    :set nu           Show line numbers.
    :set nonu         Turn off line numbers.
    ^g                Display current line number/file name.
    /hello            Search forward (down) for "hello".
    ?hello            Search backward (up) for "hello".
     n                Search again, (same direction as original).
     N                Search again, (opposite direction as original).
    :s/dog/cat        Replace "dog" with "cat" (first occurrence of dog) on the current line.
    :1,$s/dog/cat/g   Replace "dog" with "cat" (every occurrence) for the entire file.
    :1,3s/dog/cat/g   Replace "dog" with "cat" on lines 1 -> 3 of the file, every occurrence.

vi                    Begin editing unnamed file.
vi file1              Begin editing file1.
vi file1 file2 file3  Begin editing 3 files, file1 will appear initially.
vi *.txt              Begin editing all files ending in '.txt'.
vi -r important.file  View file 'important.file' in read-only mode.
view important.file   Same as vi -r.

Note that the following commands are to be executed from command mode:

- If you started vi with more than 1 file name on the command line, you can type:
  :n
  to go to the next file in the list of files you supplied.

- If you have entered :n one or more times to move through a list of files, you can return to the first file (the initial file that appeared when you started vi) by typing:
  :rew

- You can list all the files that you gave vi on the command line (the current file will appear inside '[' ']') using the following command:
  :args

- Once vi is running, you can jump directly to a new file by typing:
  :e the.new.file.name

- While you are running vi, if you have changed the current file via:
  :rew, :e, :n
  you can swap back to the previous file using:
  :e#
  This is especially useful when you are entering long pathnames after :e