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Full Discussion: Using Grep in a Shell Script
Top Forums Shell Programming and Scripting Using Grep in a Shell Script Post 66608 by zazzybob on Wednesday 16th of March 2005 07:51:37 AM
Old 03-16-2005
So each file has a consistent number of lines, right?

The following (g)awk program will do the trick. Just set the modulus to whatever you need (i.e. if the filenames appear every 5 lines change the modulus to $0 % 5). Save this as whatever.awk and make executable, then invoke with
$ ./whatever.awk input_file
Code:
#!/usr/bin/gawk -f

BEGIN { FS="\n" }

{ if ( $0 % 4 == 0 ) {
  filename = $0
} else {
  print $0 >> filename
} }


Here's a way of doing it using bash
Code:
#!/bin/bash

current_line=0
# file_length is the number of lines in each "file"
# excluding the n.txt lines....
file_length=3

while read line; do
  if [ $(( current_line % ( file_length + 1 ) )) -eq "0" ]; then
     filename="$line"
  else
     echo "$line" >> $filename
  fi
  (( current_line = current_line + 1 ))
done < input_file

Cheers
ZB
 

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LEARN ABOUT DEBIAN

pirl

PIRL(1p)						User Contributed Perl Documentation						  PIRL(1p)

NAME

       pirl - A read-eval-print loop in Perl (see Shell::Perl)

SYNOPSIS

	   pirl
	   pirl --noornaments

	   pirl --version
	   pirl -v

EXAMPLE SESSION

	   $ pirl
	   Welcome to the Perl shell. Type ':help' for more information

	   pirl @> 1+1
	   2

	   pirl @> use YAML qw(Load Dump);
	   ()

	   pirl @> $data = Load("--- { a: 1, b: [ 1, 2, 3] }
");
	   { a => 1, b => [1, 2, 3] }

	   pirl @> $var = 'a 1 2 3'; $var =~ /(w+) (d+) (d+)/
	   ("a", 1, 2)

	   pirl @> :q

DESCRIPTION

       This script is the command-line interface to "Shell::Perl" which does it all.

       By now, read the fine details at "Shell::Perl" documentation.

OPTIONS

	   --ornaments - turn on terminal ornaments (default)
	   --noornaments - turn off terminal organments

	   --version, -v - prints version info and exits with 0

SEE ALSO

       Shell::Perl

BUGS

       Please report bugs via CPAN RT <http://rt.cpan.org/NoAuth/Bugs.html?Dist=Shell-Perl>.

AUTHOR

       Adriano R. Ferreira, <ferreira@cpan.org>

       Caio Marcelo, <cmarcelo@cpan.org>

COPYRIGHT AND LICENSE

       Copyright (C) 2007aXX2011 by Adriano R. Ferreira

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.10.1							    2011-03-10								  PIRL(1p)
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