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Top Forums Shell Programming and Scripting Linux shell script to insert new lines based on delimiter count Post 302986213 by Don Cragun on Tuesday 22nd of November 2016 05:14:09 AM
Old 11-22-2016
As long as the NUL bytes are field terminators (not field separators) and there are 80 fields per record, the following will add a <newline> character at the end of each input record in the file MED_BIL_accmasked.DAT and store the results in a file named MED_BIL_withNL.DAT:
Code:
tr '\0' '\r' < MED_BIL_accmasked.DAT |
awk '
BEGIN {	RS = ORS = "\r"
}
1
!(NR % 80) {	printf("\n")
}' |
tr '\r' '\0' > MED_BIL_withNL.DAT

I have tested the above code on a macOS system (using a BSD version of awk and it does what I understand your requirements to be. (But, since you didn't post your desired output for your sample input, I can't be sure.)

If you want to try the above code on a Solaris/SunOS system, change awk to /usr/xpg4/bin/awk or nawk.

If you are using gawk, it might let you get by with just:
Code:
gawk '
BEGIN {	RS = ORS = "\0"
}
1
!(NR % 80) {	printf("\n")
}' MED_BIL_accmasked.DAT > MED_BIL_withNL.DAT

but I haven't tested this with gawk and do not know that it will accept a NUL character as an input or output record separator.
This User Gave Thanks to Don Cragun For This Post:
 

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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 v5.18.2 2013-03-08 Regexp::Common::delimited(3)
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