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Top Forums Shell Programming and Scripting Using awk and grep for sql generation Post 302983920 by greet_sed on Tuesday 18th of October 2016 12:53:03 PM
Old 10-18-2016
Hi,

Chubler_XL & Don solutions are perfect Smilie

Hope following details helps .

Code:
T[$1"."$2]=$3
T[$1"."F[i+1]]=="string"

Considering input sample in desc.txt , field seperator is set to F "[ |]*".
Code:
 T[$1"."$2]=$3

$3 will be empty "".

Here , i is assigned from for loop and F[0] inner array gets value from split function .
Note string is unset and it is empty .
Code:
T[$1"."F[i+1]]=="string"

Quote:
FNR==NR would process desc.txt
FNR>1 would process pk.txt
FNR - Current input record read in current file. When awk start processing a new input file, it resets FNR to zero.
NR - Number of current input record from beginning of the script started.
FNR==NR is equal to one ,only once ie when reading the first input file.
It is next command in first block {} which makes awk not to read the second pattern (FNR>1) and its statement block ({}).
Hence first input file ie desc.txt is completely processed (here 3 lines).
 

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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). ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+-----------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+-----------------+ |Availability | SUNWgawk | +--------------------+-----------------+ |Interface Stability | Volatile | +--------------------+-----------------+ NOTES
Source for gawk is available on http://opensolaris.org. Free Software Foundation Nov 3 1999 IGAWK(1)
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