VI EDITOR INFORMATION
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The vi editor is a screen text editor which may be used to edit  existing  files
or create new files. Some useful vi commands are:

i - insert at current cursor position

I - insert at the beginning of the current line

a - insert after current cursor position

A - insert at the end of the current line

o - insert after the current line

O - insert before the current line

/xyz - find the next occurrence of string 'xyz'

?xyz - find the previous occurrence of string 'xyz'

n - perform the same function as indicated by the last ? or / search command

Ns - substitute for N characters whatever is typed up to the ESC key

r - same as 1s but needs no terminating ESC

R - same as Ns where N is the number of characters typed up to ESC

S - substitute for the entire line

Ncw - substitute for N words whatever is typed up to ESC

Ndw - delete N words

Ndd - delete N lines

Nx - delete N characters

NX - delete the previous N characters

:w -  write the file to disk

:wq (or ZZ) - write the file to disk and quit

:q  - quit without changing the file

:q! - quit without changing the file (leave it as it was at the beginning of
      this vi session)

:I,Js/string-1/string-2/g - substitute string-2 for all occurrences of
      string-1 from lines I to J

Nw - move forward N words

Nb - move backward N words

NG - go to line N in the file

G - go to the end of the file

u - undo the previous command

% - find the parenthesis matching the one currently positioned at 

Every insertion of characters into a file must be terminated by an ESC to  enter
the  insertion. Most commands allow an optional number N to precede the command.
This causes the command to be executed N times.  If this number is omitted, then
the default is to execute the command once.