vi (visual) text editor

A screen text editor written by Bill Joy in 1976 and commonly available on Unix and Linix systems today.

command - function

h (left), j (down), k (up), l (left), 0 (beginning of the line), $ (end of the line)

i - insert at cursor (escape to stop)

x - delete a character

D - delete to end of line

dd - delete entire line

dw - delete word

u - undo last chage

U - undo all changes on this line

[n]G - Goto end of file [n:cardinal goto nth line]

j - Join next line to this line

/ - search for regular expression

n - next occurance of search expression

:q[!] - quit without saving [!:even if changes have been made]

:w[!][ file] - write [!:even if the file is write protected][file:to another file]

:e file - edit another file

:r file - insert a file

See also:

• http://docs.freebsd.org/44doc/usd/12.vi/paper.html  "An Introduction to Display Editing with Vi" by Mark Horton and vi programmer Bill Joy