Content Suck and Manual Suck Underground

Vi editor เป็นคำสั่งพื้นฐานในระบบปฏิบัติการ Unix ซึ่งเป็นโปแกรม editor ใช้สำหรับ เพิ่ม ลบ แก้ไข ไฟล์ข้อมูลใดๆ โดยมีคำสั่งพื้นฐานดังนี้
 - ถ้าต้องการเปิดเพื่อแก้ไขไฟล์ #vi filename
 - บันทึกไฟล์ที่ทำการแก้ไข :w หรือ :wq บันทึกแล้วออกจากโปรแกรม
 - เมื่อต้องการแก้ไขไฟล์ใดๆ ต้องเปลี่ยน Mode โดยกด Esc แล้วตามด้วยคำสั่งที่ต้องการ เช่น
  Esc i คือการเพิ่มข้อมูล
  Esc x คือการลบอักขระ

สำหรับคอมมานอื่นๆก็

Counts
  A number preceding any vi command tells vi to repeat
 that command that many times.

Cursor Movement

h move left (backspace)

j move down

k move up

l move right (spacebar)

[return] move to the beginning of the next line

$ last column on the current line

0 move cursor to the first column on the
  current line

^ move cursor to first nonblank column on the
  current line

w move to the beginning of the next word or
  punctuation mark

W move past the next space

b move to the beginning of the previous word
  or punctuation mark

B move to the beginning of the previous word,
  ignores punctuation

e end of next word or punctuation mark

E end of next word, ignoring punctuation

H move cursor to the top of the screen

M move cursor to the middle of the screen

L move cursor to the bottom of the screen

Screen Movement

G move to the last line in the file

xG move to line x

z+ move current line to top of screen

z move current line to the middle of screen

z- move current line to the bottom of screen

^F move forward one screen

^B move backward one line

^D move forward one half screen

^U move backward one half screen

^R redraw screen
  ( does not work with VT100 type terminals )

^L redraw screen
  ( does not work with Televideo terminals )

Inserting

r replace character under cursor with next
  character typed

R keep replacing character until [esc] is hit

i insert before cursor

a append after cursor

A append at end of line

O open line above cursor and enter append mode

Deleting

x delete character under cursor

dd delete line under cursor

dw delete word under cursor

db delete word before cursor

Copying Code

yy (yank)’copies’ line which may then be put by
  the p(put) command. Precede with a count for
  multiple lines.

Put Command
  brings back previous deletion or yank of lines,
 words, or characters

P bring back before cursor

p bring back after cursor

Find Commands

? finds a word going backwards

/ finds a word going forwards

f finds a character on the line under the
  cursor going forward

F finds a character on the line under the
  cursor going backwards

t find a character on the current line going
  forward and stop one character before it

T find a character on the current line going
  backward and stop one character before it

; repeat last f, F, t, T

Miscellaneous Commands

. repeat last command

u undoes last command issued

U undoes all commands on one line

xp deletes first character and inserts after
  second (swap)

J join current line with the next line

^G display current line number

% if at one parenthesis, will jump to its mate

mx mark current line with character x

‘x find line marked with character x

NOTE: Marks are internal and not written to the file.

Line Editor Mode
 Any commands form the line editor ex can be issued
 upon entering line mode.

To enter: type ‘:’

To exit: press[return] or [esc]

ex Commands
 For a complete list consult the
 UNIX Programmer’s Manual

READING FILES
 copies (reads) filename after cursor in file
 currently editing

:r filename

WRITE FILE

:w saves the current file without quitting

MOVING

:# move to line #

:$ move to last line of file