1. Copyrights© 2008 BVU Amplify DITM Basics of OS,UNIX/LINUX and Shell programming Page:1 Lesson 3: Vi- editor By Simi By Simi

2. Copyrights© 2008 BVU Amplify DITM Basics of OS,UNIX/LINUX and Shell programming Page:2 The Vi-Editor  Vi commands : vi is a visual display- presentation editor based on an underlying line editor(ex).  Characters are normally interpreted as commands (command mode).  Some commands allow text to be entered until the key is pressed (insert mode)

3. Copyrights© 2008 BVU Amplify DITM Basics of OS,UNIX/LINUX and Shell programming Page:3 The Vi-Editor  Vi editor is invoked as  # Vi filename : full editing functionality  # View filename : file(s) opened read only

4. Copyrights© 2008 BVU Amplify DITM Basics of OS,UNIX/LINUX and Shell programming Page:4 The Vi-Editor  Three modes of operation (i) Command :for moving around the text ( default as startup) (ii) Insert:for adding text (iii) Execution :extended commands ( compatible with ed)

5. Copyrights© 2008 BVU Amplify DITM Basics of OS,UNIX/LINUX and Shell programming Page:5 Vi - Commands to Move the cursor  0start of line  $to go to the end of line  nGgo to line n  Ggo the last line  h to move towards the left side  jto move toward the down side  kto move toward the up side  lto move toward the right side

6. Copyrights© 2008 BVU Amplify DITM Basics of OS,UNIX/LINUX and Shell programming Page:6 Commands to Move the cursor  bto move toward the beginning of word  eto move to the end of word.  wto move to the start of next word.  ^+Fto go forward one screen  ^+Bto go backward one screen

7. Copyrights© 2008 BVU Amplify DITM Basics of OS,UNIX/LINUX and Shell programming Page:7 Commands to Move the cursor  ^+D to move down half screen  ^+U to move up half screen  <-(backspace)to change character entered  Spacebar to move forward  Esc to come out of any mode.

8. Copyrights© 2008 BVU Amplify DITM Basics of OS,UNIX/LINUX and Shell programming Page:8 Vi – Insert mode  Esc + i to enter into insert mode  iinsert before character  aappend after character  Iinsert at the start of line  Ainsert at the end of line  Oopens new line above the cursor  oopens new line below the cursor

9. Copyrights© 2008 BVU Amplify DITM Basics of OS,UNIX/LINUX and Shell programming Page:9 Vi – delete mode  Esc + d to enter into delete mode  x delete character under cursor  X delete character to the left of cursor  dd deletes complete line  dwdeletes to the start of next word  d3  deletes next three characters

10. Copyrights© 2008 BVU Amplify DITM Basics of OS,UNIX/LINUX and Shell programming Page:10 delete mode  d3  deletes previous three characters  d 0 deletes to the start of line  d1G deletes to the start of file  dGdeletes to the end of file  Ddeletes to the end of line.

11. Copyrights© 2008 BVU Amplify DITM Basics of OS,UNIX/LINUX and Shell programming Page:11 Vi – Change/Replace commands  r replace cursor under cursor( type new character under cursor)  Rreplaces ( overtype text) until escape( Esc) is pressed.  cc change complete line  cwchange to the start of next word  c3  change next three characters

12. Copyrights© 2008 BVU Amplify DITM Basics of OS,UNIX/LINUX and Shell programming Page:12 Change/Replace commands  c 0changes to the start of line  c1Gchanges to the start of file  cGchanges to the end of file  c$ changes to the end of line or or  Cchanges to the end of line

13. Copyrights© 2008 BVU Amplify DITM Basics of OS,UNIX/LINUX and Shell programming Page:13 Vi – Copy and Paste commands  Changed text is stored in buffer multiple buffers can be used  Text can be copied using the yank(copy) command  y yanks( copies) text specifying size of text to copy  yyyank complete line  ywyank to start of next word  y0yank to start of line  yGyank to end of file

14. Copyrights© 2008 BVU Amplify DITM Basics of OS,UNIX/LINUX and Shell programming Page:14 Copy and Paste commands  Text can be pasted back  p (lowercase) paste buffer after current position  P (uppercase)paste buffer before current position

15. Copyrights© 2008 BVU Amplify DITM Basics of OS,UNIX/LINUX and Shell programming Page:15 Vi - Save Commands  Vi - Save Commands  Esc + Shift : to enter into save mode  :q quits vi editor without saving anything  :wsaves changes permanently without quitting  :q!quits forcefully

16. Copyrights© 2008 BVU Amplify DITM Basics of OS,UNIX/LINUX and Shell programming Page:16 Save Commands  :w!saves forcefully  :wqsaves & come out from vi editor  :xsave and quit(exit)  Shift+zzsaves & come out from vi editor

17. Copyrights© 2008 BVU Amplify DITM Basics of OS,UNIX/LINUX and Shell programming Page:17 Vi – Search and Replace Commands  Searches are very powerful  /patternsearches forward pattern  ?patternsearches backward for pattern  Nrepeat last search in opposite direction

18. Copyrights© 2008 BVU Amplify DITM Basics of OS,UNIX/LINUX and Shell programming Page:18 Search and Replace Commands  Search can be combined with the replace action  :1, $s/old/new/g replaces all occurrences of old with new  :1, 20s/old/new/gcin the first 20 lines, replace all occurrences of old with new but ask for confirmation of each change.  :n, ms/old/new/g replaces all occurrences of old with new between lines n and m.

19. Copyrights© 2008 BVU Amplify DITM Basics of OS,UNIX/LINUX and Shell programming Page:19 Thank You Thank You