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Full Discussion: Unable to understand associative nature of awk arrays
Top Forums UNIX for Dummies Questions & Answers Unable to understand associative nature of awk arrays Post 302091736 by nervous on Thursday 5th of October 2006 01:37:58 AM
Old 10-05-2006
Unable to understand associative nature of awk arrays
About associative nature of awk arrays i'm still confused, not able to understand yet how array element can be accessed based on a string, I got one example at gawk manual to illustrate associative nature of awk arrays, it goes here:
Code
Code:
awk '
# Print list of word frequencies
{
    for (i = 1; i <= NF; i++)
        freq[$i]++
}

END {
    for (word in freq)
        printf "%s\t%d\n", word, freq[word]
}' test.txtIf

this is the input file:
Code:
Kuwait  UAE     Qatar   KSA     Jordan
Lebanon Egypt   Syria   Kuwait  Qatar

Here is the output:
Code:
Syria   1
KSA     1
Lebanon 1
UAE     1
Qatar   2
Egypt   1
Jordan  1
Kuwait  2

Can you pls explain the contents of freq at each iteration of first rule and also what happens at each iteration of END rule? It would be a great favor.

Thanks in advance.

Cheers,
An AWK student
 

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LEARN ABOUT DEBIAN

igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

Free Software Foundation					    Nov 3 1999								  IGAWK(1)
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