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uva.ulb.ac.be/cit_courseware/unix/test4.htm

Learning UNIX Copyright Brian Brown, 1988-2000. All rights reserved.

This material may not be reproduced in printed or electronic format without the express permission of

the author.

Test 4

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The following questions use this data file. All questions relate to awk

First Last Age Sex phone Smoking City

Sue Williams 23 F 5277089 N PoriruaJoe Bloggs 45 M 3450999 Y Upper-Hutt

Bill Hunt 23 M 2341897 Y Georgetown

Karen White 19 F 4532367 Y Palmerston

Bobby Waters 17 M 3289765 N Lower-Hutt

Sam Brown 26 M 3276890 N Lower-Hutt

Fred Kent 56 M 2770876 N Upper-Hutt

Susan George 34 F 3421345 Y Belmont

Linda Gray 21 F 4563213 Y Masterton

Beth Gables 32 F 6785436 Y Auckland

Liz Samuels 33 F 6547890 N Wellington

Debby Wills 43 F 8964556 Y Wellington

1. List all smokers

$6 == "F" { print $0 }

$6 == "Y" { print $0 }

$4 == "F" { print $0 }

$4 == "N" { print $0 }

2. List all non-smoking males

$6 == "M" && $4 == "N" { print $0 }$4 == "M" || $6 == "N" { print $0 }

$6 == "M" AND $6 == "N" { print $0 }

$4 == "M" && $6 == "N" { print $0 }

3. List all smoking females under 25

$6 == "N" && $4 == "F" && $3

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uva.ulb.ac.be/cit_courseware/unix/test4.htm

$6 == "Y" && $4 == "F" || $3 < 25 { print $0 }

4. List all non-smoking males who live in Auckland

$6 == "N" || $4 == "M" && $7 ~ "Auckland" { print $0 }

$6 == "N" && $4 == "M" && $7 ~ "Auckland" { print $0 }

$6 == "N" && $4 == "M" && $7 = "Auckland" { print $0 }

$6 != "N" && $4 == "M" && $7 !~ "Auckland" { print $0 }

5. List all smoking females under 25 who live in Wellington or Palmerston

$6 == "N" || $4 == "F" && $3 < 25 && $7 ~ /(Wellington|Palmerston)/ { print $0 }

$6 == "Y" && $4 == "F" && $3 < 25 && $7 ~ /(Wellington|Palmerston)/ { print $0 }

$6 == "Y" && $4 == "M" ||$3 < 25 && $7 !~ /(Wellington|Palmerston)/ { print $0 }

$6 == "N" && $4 == "M" && $3 < 25 && $7 ~ /(Wellington|Palmerston)/ { print $0 }

6. Which of the following lists the total number of non-smokers

$6 == "N" {nosmokers++}

END {print "Number of nonsmokers is ", nonsmokers }

$6 == "N" {nosmokers--}

END {print "Number of nonsmokers is ", nonsmokers }

7. Which of the following lists the number of smokers as a percentage of the total number of people in the file

$6 == "Y" {smokers++}

END {print "Number of smokers as a % is ", (smokers + NR) * 100 }

$6 == "Y" {smokers++}END {print "Number of smokers as a % is ", (smokers/NR) * 100 }

8. All records preceeded by their line number

{print NR, ":\t", $0}

{print NF, ":\t", $0}

{print 1, ":\t", $0}

9. Which of the following prints the number of non-smokers in Wellington

$6 == "N" || $7 ~ /Wellington/ { ns++ }

END { print "Number of Wellington non-smokers is ", ns }

$6 == "N" && $7 ~ /Wellington/ { ns++ }

END { print "Number of Wellington non-smokers is ", ns }

10. Which of the following prints the record of the person with the longest surname

{if (length($2)>sum)

{

sum = length($2)

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