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Top Forums Shell Programming and Scripting awk: reading into an array and then print the value corresponding to index Post 302328513 by akshaykr2 on Wednesday 24th of June 2009 12:32:37 PM
Old 06-24-2009
Question awk: reading into an array and then print the value corresponding to index

I am beginner in awk

awk 'BEGIN{for(i=1;(getline<"opnoise")>0;i++) arr[i]=$1}{print arr[20]}'

In the above script, opnoise is a file, I am reading it into an array and then printing the value corresponding to index 20. Well this is not my real objective, but I have posted this example to describe the problem.

The problem is when I execute the script there is no activity(no error, just a blank) and the body i.e, the print statement, execute only when I hit "ENTER" for the second time. Also gawk does not exit to command prompt automatically, I have to hit CTRL+C to exit and awk gets displayed while exiting.

Here is what happens,

user@server ~/folder
$ awk 'BEGIN{for(i=1;(getline<"opnoise")>0;i++) arr[i]=$1}{print arr[20]}'

684
awk

user@server ~/folder
$
 

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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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