Vi editor in linux

Vi editor in linux

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  VI Editor InLinux  Page 1
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   Page 2 Agenda WHAT IS VI EDITOR? HISTORY OF VI. CHARACTERISTIC OF VI. STARTING VI MODE IN VI EDITOR. COMMON VI COMMAND HOW TO EXIT FROM VI
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   Page 3 What is Vi Editor?  The visual editor on the Linux.  The vi editor comes with every version of Linux or Unix.  Using vi is similar to using other editors in that you can see your file on the screen ..  The vi editor is the most popular editor in linux. The current version is really "vim", but to invoke it simply type "vi".  Before vi the primary editor used on Unix was the line editor - User was able to see/edit only one line of the text at a time  The vi editor is not a text formatter (like MS Word, Word Perfect, etc.) - you cannot set margins - center headings - Etc…
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   Page 4 History of Vi Editor  Although other stories exist, the true one tells that vi was originally written by Bill Joy in 1976.  Who is Bill Joy you ask? - He co-founded Sun Microsystems in 1982 and served as chief scientist until 2003.
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   Page 5 Characteristics of vi  The vi editor is: - A very powerful - It is hard to learn, specially for windows users - Move from point to point in the file, and make changes. - Available on all UNIX systems
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   Page 6 Starting vi  Type vi <filename> at the shell prompt  After pressing enter the command prompt disappears and you see tilde(~) characters on all the lines  These tilde characters indicate that the line is blank
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   Page 7 Vi modes  There are three modes in vi - Command mode - Accessed by typing Esc - In this mode all the keys pressed by the user are interpret to the editor command. - Input mode - Accessed by typing “i” - This mode permits insertion of new text, editing of existing text or replacement of existing text. Ex mode( Last Line Mode) -The bottom line of the vi screen is called ex mode. - When you start vi by default it is in command mode -You exit the input mode by pressing the Esc key to get back to the command mode.
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   Page 8 VI EDITING MODES Command Mode Input Mode Last-Line Mode Esc Insert (i, I) Append (a, A), Open (o, O) Change (c), Replace (r, R) : Return
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   Page 9 Common Vi Commands  Moving Cursor Position  You can move around only when you are in the command mode  Arrow keys usually works(but may not)  The standard keys for moving cursor are: - h - for left - l - for right - j - for down - k - for up  w - to move one word forward  b - to move one word backward  $ - takes you to the end of line  <enter> takes the cursor the beginning of next line
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   Page 10 Conti..  - - (minus) moves the cursor to the first character in the current line  H - takes the cursor to the beginning of the current screen Home position)  L - moves to the Lower last line  M - moves to the middle line on the current screen
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   Page 11 Conti..  Control-d scrolls the screen down (half screen)  Control-u scrolls the screen up (half screen)  Control-f scrolls the screen forward (full screen)  Control-b scrolls the screen backward (full screen).
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   Page 12 Editing text  x - deletes the current character  d - is the delete command but pressing only d will not delete anything you need to press a second key - dw - deletes to end of word - dd - deletes the current line - d0 - deletes to beginning of line  There are many more keys to be used with delete command  The vi commands can be used followed by a number such as n<command key(s)> - For example dd deletes a line 5dd will delete five lines.
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   Page 13 Copy, cut and paste in vi  yy - (yank) copy current line to buffer  nyy - Where n is number of lines  p - Paste the yanked lines from buffer to the line below  P - Paste the yanked lines from buffer to the line above
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   Page 14 Undo and repeat command  u - undo the changes made by editing commands  . - (dot or period) repeats the last edit command
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   Page 15 How to exit from vi (command mode)  ZZ is for save and Exit (Note this command is uppercase)  :q <enter> is to exit, if you have not made any changes to the file
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   Page 16 Thank You