In the last class… The vi basics command, input and ex mode Input mode – entering and replacing text Saving text and quitting – the ex mode.

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In the last class… The vi basics command, input and ex mode

Presentation transcript:

In the last class… The vi basics command, input and ex mode Input mode – entering and replacing text Saving text and quitting – the ex mode

CONTENTS Navigation Editing text Undoing last editing instructions Repeating the last command Searching for a pattern Substitution – search and replace conclusion

NAVIGATION A command mode command doesn’t show up on screen but simply performs a function To move the cursor in four directions kmoves cursor up jmoves cursor down hmoves cursor left l moves cursor right

Word navigation bmoves back to beginning of word emoves forward to end of word wmoves forward to beginning word Example 5b takes the cursor 5 words back 3w takes the cursor 3 words forward

Moving to line extremes Moving to the beginning or end of a line To move to the first character of a line 0 or | 30| moves cursor to column 30 $ moves to the end of the current line The use of these commands along with b,e,w is allowed

Scrolling ctrl-fscrolls forward ctrl-bscrolls backward 10ctrl-fscroll 10 pages and navigate faster ctrl-dscrolls half page forward ctrl-uscrolls half page backward

Absolute movement The editor displays the total number of lines in the last line Ctrl-gto know the current line number 40Ggoes to line number 40 1Ggoes to line number 1 Ggoes to end of file

EDITING TEXT They use operators, such as, ddelete yyank (copy) dddelete entire line yycopy entire line 6dddeletes the current line and five lines below examples

Moving text (p) puts the text at the new location Copying text (y and p) yycopies current line 10yycopies current line & 9 lines below Joining lines (J) Jto join the current line and the line following it 4Jjoins following 3 lines with current line

UNDOING In command mode, to undo the last change made, we use u To discard all changes made to the current line, we useU

REPEATING THE LAST COMMAND The. (dot) command is used for repeating the last instruction in both editing and command mode commands Ex: 2dd deletes 2 lines from current line and to repeat this operation, type. (dot)

SEARCHING FOR A PATTERN / search forward ? search backward /printfthe search begins forward to position the cursor on the first instance of the word ?patternsearches backward for the most previous instance of the pattern nrepeats search in same direction of original search

SUBSTITUTION We can perform search and replace in ex mode using :s Its syntax is, :address/source_pattern/target_pattern/flags :1,$s/director/member/g :1,50s/unsigned//g :3,10s/director/member/g :.s/director/member/g :$s/director/member/g

CONCLUSION vi basics Input mode Saving text and quitting Navigation Ediying text Undoing, repeating last action Searching for a pattern Substitution

THANK YOU