Shantanu's Blog

Database Consultant

November 17, 2023

 

awk Case Study - 7

Print the names of the countries in Asia along with their populations and capitals:

# cat capitals
USSR Moscow
Canada Ottawa
China Beijing
USA Washington
Brazil Brasilia
India New Delhi
Mexico Mexico
France Paris
Japan Tokyo
Germany Bonn
England London

# cat countries
USSR 8649 275 Asia
Canada 3852 25 North America
China 3705 1032 Asia
USA 3615 237 North America
Brazil 3286 134 South America
India 1267 746 Asia
Mexico 762 78 North America
France 211 55 Europe
Japan 144 120 Asia
Germany 96 61 Europe
England 94 56 Europe

(make sure that the files are tab separated)

# awk 'BEGIN { FS = "\t"}
FILENAME == "capitals" {
    cap[$1] = $2
}
FILENAME == "countries" && $4 == "Asia" {
    print $1, $3, cap[$1]
}' capitals countries


USSR 275 Moscow
China 1032 Beijing
India 746 New Delhi
Japan 120 Tokyo

It would certainly be easier if we could just say something like

continent ~ /Asia/ { print $country, $population, $capital}

and have a program figure out where the fields are and how to put them together. This is how we would phrase this query in qawk

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