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Top Forums UNIX for Beginners Questions & Answers awk with (if condition) Post 303046309 by sea on Thursday 30th of April 2020 11:22:29 AM
Old 04-30-2020
Originally Posted by RudiC
Try this for leading header and sorted data:
awk 'NR == 1; $4 < 7000 {print | "sort -k4"}' file
Name	tDesignation	tDepartment	tSalary
Thomas	Manager	Sales	5000
Jason	Developer	Technology	5500
Vicky	DBA	Technology	6000

I slightly modified your code...
Was not my first attempt, just one of the... lets do this variant with the current variable... moments...

I have no idea WHY this works, because I wanted to EXclude the 'Name'-line with != and =! just to be sure:
awk '$1 == Name; $4 < 7000 {print | "sort -k4"}' file.txt
Thomas	Manager		Sales		5000
Jason	Developer	Technology	5500
Vicky	DBA		Technology	6000

awk '$1 ==! "Name"; $4 < 7000 {print | "sort -k4"}' file.txt
Thomas	Manager		Sales		5000
Jason	Developer	Technology	5500
Vicky	DBA		Technology	6000

But I still dont understand why $1 == Name removes the Name/tSalary-line

Last edited by sea; 04-30-2020 at 12:31 PM..
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Moose::Cookbook::Roles::ApplicationToInstance(3pm)	User Contributed Perl Documentation	Moose::Cookbook::Roles::ApplicationToInstance(3pm)

Moose::Cookbook::Roles::ApplicationToInstance - Applying a role to an object instance VERSION
version 2.0603 SYNOPSIS
package MyApp::Role::Job::Manager; use List::Util qw( first ); use Moose::Role; has 'employees' => ( is => 'rw', isa => 'ArrayRef[Employee]', ); sub assign_work { my $self = shift; my $work = shift; my $employee = first { !$_->has_work } @{ $self->employees }; die 'All my employees have work to do!' unless $employee; $employee->work($work); } package main; my $lisa = Employee->new( name => 'Lisa' ); MyApp::Role::Job::Manager->meta->apply($lisa); my $homer = Employee->new( name => 'Homer' ); my $bart = Employee->new( name => 'Bart' ); my $marge = Employee->new( name => 'Marge' ); $lisa->employees( [ $homer, $bart, $marge ] ); $lisa->assign_work('mow the lawn'); DESCRIPTION
In this recipe, we show how a role can be applied to an object. In this specific case, we are giving an employee managerial responsibilities. Applying a role to an object is simple. The Moose::Meta::Role object provides an "apply" method. This method will do the right thing when given an object instance. MyApp::Role::Job::Manager->meta->apply($lisa); We could also use the "apply_all_roles" function from Moose::Util. apply_all_roles( $person, MyApp::Role::Job::Manager->meta ); The main advantage of using "apply_all_roles" is that it can be used to apply more than one role at a time. We could also pass parameters to the role we're applying: MyApp::Role::Job::Manager->meta->apply( $lisa, -alias => { assign_work => 'get_off_your_lazy_behind' }, ); We saw examples of how method exclusion and alias working in Moose::Cookbook::Roles::Restartable_AdvancedComposition. CONCLUSION
Applying a role to an object instance is a useful tool for adding behavior to existing objects. In our example, it is effective used to model a promotion. It can also be useful as a sort of controlled monkey-patching for existing code, particularly non-Moose code. For example, you could create a debugging role and apply it to an object at runtime. AUTHOR
Moose is maintained by the Moose Cabal, along with the help of many contributors. See "CABAL" in Moose and "CONTRIBUTORS" in Moose for details. COPYRIGHT AND LICENSE
This software is copyright (c) 2012 by Infinity Interactive, Inc.. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself. perl v5.14.2 2012-06-28 Moose::Cookbook::Roles::ApplicationToInstance(3pm)

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