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Top Forums Shell Programming and Scripting Linux shell script to insert new lines based on delimiter count Post 302986016 by digitalnirvana on Friday 18th of November 2016 09:09:11 AM
Old 11-18-2016
Apologies, my bad. I should've uploaded the file. Attached is a masked .dat file renamed as .txt for uploading.

On opening it with notepad++ in Windows, the null characters show up as boxes. In a Linux vi the nulls are ^@.

All the records in this file are in one row. This particular file has 2 records followed by the trailer record.
  • First record = starts at the beginning of the file 00000230 (this field gives the length of the record in bytes)
  • Second record = starts at the next 00000230 (it is a coincidence, here both records have same length)
  • Trailer record = starts at 0000096 (the trailer length is of 96 bytes and it also has 80 delimiters of ^@ or null characters. Ignore my earlier post saying trailer has 20 delimiters. It has 80 actually)

As the field lengths are variable so we cannot define a record in terms of total length of its fields or total bytes. This is why we are defining a record as effectively having length of 80 ^@ delimiters.

I require the 1st record in one row, 2nd record in next row and so on till the end of the file, with the trailer in the last row. If there is a way of adding a newline after every 80th ^@ from the beginning till the eof, then perhaps it will work?

The only unprintable character is null ^@, no TABS or other spaces, all other characters are alphanumeric.

Please let me know if any questions. Thanks for the help
 

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Regexp::Common::delimited(3)				User Contributed Perl Documentation			      Regexp::Common::delimited(3)

NAME
Regexp::Common::delimited -- provides a regex for delimited strings SYNOPSIS
use Regexp::Common qw /delimited/; while (<>) { /$RE{delimited}{-delim=>'"'}/ and print 'a " delimited string'; /$RE{delimited}{-delim=>'/'}/ and print 'a / delimited string'; } DESCRIPTION
Please consult the manual of Regexp::Common for a general description of the works of this interface. Do not use this module directly, but load it via Regexp::Common. $RE{delimited}{-delim}{-esc} Returns a pattern that matches a single-character-delimited substring, with optional internal escaping of the delimiter. When "-delim=S" is specified, each character in the sequence S is a possible delimiter. There is no default delimiter, so this flag must always be specified. If "-esc=S" is specified, each character in the sequence S is the delimiter for the corresponding character in the "-delim=S" list. The default escape is backslash. For example: $RE{delimited}{-delim=>'"'} # match "a " delimited string" $RE{delimited}{-delim=>'"'}{-esc=>'"'} # match "a "" delimited string" $RE{delimited}{-delim=>'/'} # match /a / delimited string/ $RE{delimited}{-delim=>q{'"}} # match "string" or 'string' Under "-keep" (See Regexp::Common): $1 captures the entire match $2 captures the opening delimiter (provided only one delimiter was specified) $3 captures delimited portion of the string (provided only one delimiter was specified) $4 captures the closing delimiter (provided only one delimiter was specified) $RE{quoted}{-esc} A synonym for $RE{delimited}{q{-delim='"`}{...}} SEE ALSO
Regexp::Common for a general description of how to use this interface. AUTHOR
Damian Conway (damian@conway.org) MAINTAINANCE
This package is maintained by Abigail (regexp-common@abigail.be). BUGS AND IRRITATIONS
Bound to be plenty. For a start, there are many common regexes missing. Send them in to regexp-common@abigail.be. LICENSE and COPYRIGHT This software is Copyright (c) 2001 - 2009, Damian Conway and Abigail. This module is free software, and maybe used under any of the following licenses: 1) The Perl Artistic License. See the file COPYRIGHT.AL. 2) The Perl Artistic License 2.0. See the file COPYRIGHT.AL2. 3) The BSD Licence. See the file COPYRIGHT.BSD. 4) The MIT Licence. See the file COPYRIGHT.MIT. perl v5.16.2 2010-02-23 Regexp::Common::delimited(3)
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