02-10-2011
Quote:
Originally Posted by
atikan
wow that was genious thanks alot. can u tell me why did u use arr1[++c] instead of arr1[c] as u did for arr2[c]; and the use of next statement inside the awk body(i mean what will it do)
c is used as an index of the array a and ++c increases the value of c with 1.
arr1[1] keeps the 1e field and arr2[1] the 2nd field of the 1e line
arr1[2] keeps the 1e field and arr2[1] the 2nd field of the 2e line and so forth...
The condition NR==FNR is true if we read the first file. With the next command we read the next line of the 1e file because the commands after the next command is for processing the 2e file.
If this is new to you, you should have a read of:
Awk - A Tutorial and Introduction - by Bruce Barnett
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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)