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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 OPENSOLARIS

shells

shells(4)							   File Formats 							 shells(4)

NAME

       shells - shell database

SYNOPSIS

       /etc/shells

DESCRIPTION

       The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser-
       shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root.

       A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by  the  routines
       which search the file. Blank lines are also ignored.

       The following default shells are used by utilities: /bin/bash, /bin/csh, /bin/jsh, /bin/ksh, /bin/ksh93, /bin/pfcsh, /bin/pfksh, /bin/pfsh,
       /bin/sh, /bin/tcsh, /bin/zsh, /sbin/jsh, /sbin/sh, /usr/bin/bash, /usr/bin/csh, /usr/bin/jsh, /usr/bin/ksh, /usr/bin/ksh93, /usr/bin/pfcsh,
       /usr/bin/pfksh, /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh, and /usr/sfw/bin/zsh. /etc/shells overrides the default list.

       Invalid shells in /etc/shells could cause unexpected behavior, such as being unable to log in by way of ftp(1).

FILES

       /etc/shells    list of shells on system

SEE ALSO

       vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4)

SunOS 5.11							    20 Nov 2007 							 shells(4)
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