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Full Discussion: Capture the last record number using "awk" NR variable
Top Forums Shell Programming and Scripting Capture the last record number using "awk" NR variable Post 302991248 by zaxxon on Wednesday 8th of February 2017 08:52:13 AM
Old 02-08-2017
The number of records which is NR contains the current line number. awk has an END{} block, where when it is reached NR will have the number 21 as value in your case.
Anyway, I second what the others say, that the least complex tool needed to do the job might be the tool of choice.

If I got it right, you just want to read an input file and do something with every line.

This could generally also be done with something like this:

Code:
while read LINE; do
    echo $LINE
done < infile

...where the echo could be something else of course.
This way you don't even need to know how many lines you have to use it in a for-loop, as it cycles over every line anyway.
This User Gave Thanks to zaxxon For This Post:
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LEARN ABOUT CENTOS

ppix::regexp::structure::capture

PPIx::Regexp::Structure::Capture(3)			User Contributed Perl Documentation		       PPIx::Regexp::Structure::Capture(3)

NAME

       PPIx::Regexp::Structure::Capture - Represent capture parentheses.

SYNOPSIS

	use PPIx::Regexp::Dumper;
	PPIx::Regexp::Dumper->new( 'qr{(foo)}smx' )
	    ->print();

INHERITANCE

       "PPIx::Regexp::Structure::Capture" is a PPIx::Regexp::Structure.

       "PPIx::Regexp::Structure::Capture" is the parent of PPIx::Regexp::Structure::NamedCapture.

DESCRIPTION

       This class represents capture parentheses.

METHODS

       This class provides the following public methods. Methods not documented here are private, and unsupported in the sense that the author
       reserves the right to change or remove them without notice.

   name
	my $name = $element->name();

       This method returns the name of the capture buffer. Unless the buffer is actually named, this will be "undef".

   number
	my $number = $element->number()

       This method returns the number of the capture buffer. Note that named buffers have numbers also.

SUPPORT

       Support is by the author. Please file bug reports at <http://rt.cpan.org>, or in electronic mail to the author.

AUTHOR

       Thomas R. Wyant, III wyant at cpan dot org

COPYRIGHT AND LICENSE

       Copyright (C) 2009-2013 by Thomas R. Wyant, III

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl 5.10.0. For more details, see the full
       text of the licenses in the directory LICENSES.

       This program is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of
       merchantability or fitness for a particular purpose.

perl v5.16.3							    2014-06-10				       PPIx::Regexp::Structure::Capture(3)
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