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Full Discussion: Awk - Working with fixed length files
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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LEARN ABOUT LINUX

seq

SEQ(1)								   User Commands							    SEQ(1)

NAME

       seq - print a sequence of numbers

SYNOPSIS

       seq [OPTION]... LAST
       seq [OPTION]... FIRST LAST
       seq [OPTION]... FIRST INCREMENT LAST

DESCRIPTION

       Print numbers from FIRST to LAST, in steps of INCREMENT.

       -f, --format=FORMAT
	      use printf style floating-point FORMAT

       -s, --separator=STRING
	      use STRING to separate numbers (default: 
)

       -w, --equal-width
	      equalize width by padding with leading zeroes

       --help display this help and exit

       --version
	      output version information and exit

       If  FIRST  or  INCREMENT  is  omitted, it defaults to 1.  That is, an omitted INCREMENT defaults to 1 even when LAST is smaller than FIRST.
       FIRST, INCREMENT, and LAST are interpreted as floating point values.  INCREMENT is usually positive if FIRST  is  smaller  than	LAST,  and
       INCREMENT  is  usually  negative  if  FIRST  is	greater than LAST.  FORMAT must be suitable for printing one argument of type `double'; it
       defaults to %.PRECf if FIRST, INCREMENT, and LAST are all fixed point decimal numbers with maximum precision PREC, and to %g otherwise.

AUTHOR

       Written by Ulrich Drepper.

REPORTING BUGS

       Report seq bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report seq translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2010 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       The full documentation for seq is maintained as a Texinfo manual.  If the info and seq programs are properly installed at  your	site,  the
       command

	      info coreutils 'seq invocation'

       should give you access to the complete manual.

GNU coreutils 8.5						   February 2011							    SEQ(1)
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