VISUAL EDITOR - VI

vi stands for VISUAL EDITOR. This was developed by Bill joy of BSD.

vi has 3 modes:

n   Append or Insert mode (data entry)

n   Command or Escape Mode (editing)

n   Last Line or Ex Mode (file operations)

$ vi new

By default, when we invoke vi, we are in mode 2.

a          append

i           insert

l           move the cursor right

h          move the cursor left

k          move the cursor up

j           move the cursor down

x          delete one character

dw        delete one word

dd        deletes entire line

d$        deletes from current position to the end of line

d0        deletes from current position to the beg. of line

u          undo

J          join

G          go to specific line no.

r           replace one character

R          replace till esc. is pressed

o          open mode after the line

O          open mode before the line

yy         yanking

pp        pasting

Last Line Mode Commands: When we press : from command or escape mode, it is printed

at the last line. These commands are to be given at that colon.

:wq                   write and quit

:x                     write and quit

:q!                    quit without saving

:s ///g               substitute globally

: w                    write

:w!                    overwrite

:n                     next file

:e file                edit the file

:!                      execute a UNIX command