Week 10 - Mar 21, 2005 1

“Searching and Replacing” in vi

Week 10 Agenda

Week 10 - Mar 21, 2005 2

Letter of Employment

Dear INT120 student,

Congratulations!

Based on the excellent reference provided by your highly-respected INT120 professor...

General Motors is pleased to offer you the position of IS&S intern at a starting salary of $50,000 (USD)

Week 10 - Mar 21, 2005 3

Letter of Employment

Your benefits include:6 weeks paid holidays your choice of company car

Your probationary period lasts 3 months....during that time you must complete all work on timewith “zero defects”.

Good luck! Michael Grimaldi, President GM Canada

Week 10 - Mar 21, 2005 4

Your first AssignmentGeneral Motors has just purchased these 4 companies:

Hummer AMC Saab Vauxhall

Week 10 - Mar 21, 2005 5

Update all the GM files immediately so that all the old company names are replaced with General Motors.

Note: This has to be done quickly so that there will be no “Insider Trading” scandals

Your first Assignment

Week 10 - Mar 21, 2005 6

So...

$1,000 bonus

..if you complete thisin the next 5 minutes!

Your first Assignment

Week 10 - Mar 21, 2005 7

Tip - for Big $’s

In the workplace much of your time will be spent editing existing files

These files might be text files, scripts, or web pages

Week 10 - Mar 21, 2005 8

You do this with the vi editor

Your vi editing skills are needed to:

1. pass INT120

2. pass OPS235, OPS330, OPS440,and INT440

3. keep your job in a UNIX environment

Week 10 - Mar 21, 2005 9

Searching & Substituting in vi

The substitute command

:[address]s/search-string/replacement-string[/option]

Do not panic!

We’ll learn it 1 step at a time!

Week 10 - Mar 21, 2005 10

Searching & Substituting in vi

The substitute command

: [address]s/search-string/replacement-string[/option]

starts with a colon all vi commands that begin with a colon are executed at the

status line (ex mode or last line mode)

Week 10 - Mar 21, 2005 11

Searching & Substituting in viThe substitute command

:[address]s/search-string/replacement-string [/option]

can be nothing - will search only current line single line number - will search that line only line number,line number - search those two line

and all lines in between

Week 10 - Mar 21, 2005 12

Searching & Substituting in viThe substitute command

:[address]s/search-string/replacement-string [/option]

period - current line $ - last line in the work buffer % - entire work buffer

Week 10 - Mar 21, 2005 13

Searching & Substituting in vi

The substitute command:[address]Address Part of Work Buffer

searched 27 line 27

3,10 lines 3 through 10 inclusive

1,$ entire work buffer

Week 10 - Mar 21, 2005 14

Searching & Substituting in vi

The substitute command

:[address]s/search-string/replacement-string [/option]

the S after the address is the substitute command the / forward slash is the delimiter indicating the beginning

of the search-string

Week 10 - Mar 21, 2005 15

Searching & Substituting in vi

The substitute command

:[address]s/search-string/replacement-string

[/option]

The search-string is the regular expression you are looking for - the “pattern” you want to match.....

Week 10 - Mar 21, 2005 16

Searching & Substituting in vi

The substitute command

:[address]s/search-string/replacement-string [/option]

The replacement-string is the string that you want to use to replace the pattern you matched.

Week 10 - Mar 21, 2005 17

Searching & Substituting in vi

The substitute command:[address]s/search-string/replacement-string

[/option]with no option vi will only replace the first occurrence on a line if a search-string match is found.

/g option substitutes all occurrences (globally)

Week 10 - Mar 21, 2005 18

http://zenit.senecac.on.ca/~ling.zhu/week10/cars.html

Week 10 - Mar 21, 2005 19

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Week 10 - Mar 21, 2005 23

http://zenit.senecac.on.ca/~ling.zhu/week10/carsdone.html

Week 10 - Mar 21, 2005 24

Your Turn!

Follow the directions on your handout to edit the “General Motors” pricelist

The first group to complete this task with “zero defects” gets a BONUS!

Week 10 - Mar 21, 2005 25

Your Second Assignment

Some of our web pages aren’t loading properly.

Spot the mistakes in the code and get promoted to Chief Web Site Administrator....

Week 10 - Mar 21, 2005 26

Week 10 Homework

• practice redirection and piping• “Searching and Replacing” in vi• Prepare your term test 2 in week 12