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Top Forums Shell Programming and Scripting Awk: How to get an awk variable out to the shell, using system() ? Post 302740395 by DerekAsirvadem on Thursday 6th of December 2012 06:14:12 AM
Old 12-06-2012
Awk: How to get an awk variable out to the shell, using system() ?

I am reasonably capable with awk and its quirks, but not with shell weirdness. This has to be Bourne Shell for portability reasons. I have an awk program that is working just fine; it handles multiple input streams and produces several reports, based on the request (-v Variables). In addition to processing the stream, and producing the required report in the stream (so that it can be re-directed, etc), I write certain errors to a separate file.

Now I need to enhance the program, to write to a specific filename (constructed per execution, no problem), and to sort the contents.

I used the Site Search but nothing similar came up, due to the hundreds of badly formed thread titles.

The generic question may be as simple as the thread title.

This code snippet contains the seed of the problem, in simple form. The last two lines of code is a statement of intent; obviously it does not work as is.
Code:
BEGIN {
    ## constructed, simple form provided
    ERR_FILE =          "SERVER_yymmdd_Err.dat"
    ERR_FILE_TMP = "/tmp/SERVER_yymmdd_Err.dat"
    }

/Pattern/ {
    ## many of these; works fine
    if ( Foo != Bar ) printf Value_DMP, Foo, Bar > ERR_FILE_TMP
    }

END {
    printf "SERVER\t%s %s\n", SERVER, DATE > ERR_FILE
    ## need to get the filename out to the shell
    ## this states intention:
    system( "sort ERR_FILE_TMP >> ERR_FILE" )
    system( "rm   ERR_FILE_TMP" )
    }

Alternate approaches are welcome, as long as it does not result in a major code change.
 

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parent(3)						User Contributed Perl Documentation						 parent(3)

NAME
parent - Establish an ISA relationship with base classes at compile time SYNOPSIS
package Baz; use parent qw(Foo Bar); DESCRIPTION
Allows you to both load one or more modules, while setting up inheritance from those modules at the same time. Mostly similar in effect to package Baz; BEGIN { require Foo; require Bar; push @ISA, qw(Foo Bar); } By default, every base class needs to live in a file of its own. If you want to have a subclass and its parent class in the same file, you can tell "parent" not to load any modules by using the "-norequire" switch: package Foo; sub exclaim { "I CAN HAS PERL" } package DoesNotLoadFooBar; use parent -norequire, 'Foo', 'Bar'; # will not go looking for Foo.pm or Bar.pm This is equivalent to the following code: package Foo; sub exclaim { "I CAN HAS PERL" } package DoesNotLoadFooBar; push @DoesNotLoadFooBar::ISA, 'Foo', 'Bar'; This is also helpful for the case where a package lives within a differently named file: package MyHash; use Tie::Hash; use parent -norequire, 'Tie::StdHash'; This is equivalent to the following code: package MyHash; require Tie::Hash; push @ISA, 'Tie::StdHash'; If you want to load a subclass from a file that "require" would not consider an eligible filename (that is, it does not end in either ".pm" or ".pmc"), use the following code: package MySecondPlugin; require './plugins/custom.plugin'; # contains Plugin::Custom use parent -norequire, 'Plugin::Custom'; DIAGNOSTICS
Class 'Foo' tried to inherit from itself Attempting to inherit from yourself generates a warning. package Foo; use parent 'Foo'; HISTORY
This module was forked from base to remove the cruft that had accumulated in it. CAVEATS
SEE ALSO
base AUTHORS AND CONTRIBUTORS
Rafaeel Garcia-Suarez, Bart Lateur, Max Maischein, Anno Siegel, Michael Schwern MAINTAINER
Max Maischein " corion@cpan.org " Copyright (c) 2007-10 Max Maischein "<corion@cpan.org>" Based on the idea of "base.pm", which was introduced with Perl 5.004_04. LICENSE
This module is released under the same terms as Perl itself. perl v5.16.3 2011-03-08 parent(3)
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