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Top Forums Shell Programming and Scripting Awk - Working with fixed length files Post 302197272 by ripat on Tuesday 20th of May 2008 04:00:53 PM
Old 05-20-2008
If you have a recent version of gawk give the following a try:
Code:
BEGIN  {
        FIELDWIDTHS = "29 11 4 500"
        timestamp = strftime("%Y%m%d%j", systime())
}

$1 ~ /^1.+/ {
        seq++
        printf "%s%s%05d%s\n", $1, timestamp, seq, $4
}
$1 !~ /^1.+/ {print}

Of course, the value of FIELDWIDTH needs to be ajusted to your actual record length. But that's the idea.
 

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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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