1. Agenda Using vi Editor Starting vi Session Command / Input Modes Entering Text Editing Text Saving vi Session Aborting Editing Session

2. vi (Visual) Editor vi is a powerful, interactive, visually-oriented text editor Features: flexibility in performing various tasks ability to view many lines of text as opposed to one line at a time possible to recover file edited by vi in the event of a “system crash”

3. Starting vi Session There are two ways in order to start an editing session with vi: Enter vi filename (recommended since filename has already been assigned and changes will be saved to filename by enter ZZ while in vi). Enter vi (filename is not assigned, therefore user has to type :w filename and then enter ZZ to save file.

4. Modes There are two operational modes while using the vi editor: Command Mode (default mode when starting) Mode to allow user to give commands such as to delete text, search for strings, search & replace, save changes, abort editing session without saving changes and exit the vi editor. Input Mode Input Mode allows user to enter or edit text. If in command mode press i to enter input mode.

5. Input Mode While in input mode, the input mode indicator should appear as INPUT on the bottom of the vi screen. If this indicator does not appear when you press i then type: :set showmode After typing or “inserting” text, type to return to Command Mode.

6. Entering Text Type in your text, but it is recommended to press ENTER before the end of the line (i.e. do not use word-wrap). Also, do not use to end a line. Tilde “~” characters below text represent end of file. Error Correction (As you type): CTRL-hDelete a letter CTRL-wDelete a word CTRL-uDelete a line

7. Editing Text You can move around to text in the screen with the arrow keys while in Insert Mode. For more advanced editing, you can return to Command Mode and use appropriate editing commands

8. Editing Commands (Within Command Mode) Commands: dDeletes current character dwDeletes to the end of the word ddDeletes the current line uUndo. “Undoes” the last operation that user performed

9. Saving vi Session When you create a file using vi, all work performed during vi session is stored in a Word Buffer (temporary storage) until the user saves their work. When saving, changes in the work buffer are added to a new (empty) file if creating a new file, or changes in work buffer modify existing (previously created) file

10. Saving vi Session To save your vi session, you must make sure you are in command mode by pressing To save your changes and exit, enter ZZ (i.e. two capital z’s)

11. Aborting Editing Session If you make a huge mistake in your editing session (that undo cannot solve), you can abort your session without modifying the contents your file (dump the work buffer) To abort the current editing session, press :q!