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Top Forums Shell Programming and Scripting Find header in a text file and prepend it to all lines until another header is found Post 303036769 by verdepollo on Wednesday 10th of July 2019 09:50:20 PM
Old 07-10-2019
Find header in a text file and prepend it to all lines until another header is found

I've been struggling with this one for quite a while and cannot seem to find a solution for this find/replace scenario. Perhaps I'm getting rusty.

I have a file that contains a number of metrics (exactly 3 fields per line) from a few appliances that are collected in parallel. To identify the appliance the metrics belong to, there's a header (the name of the asset basically) that is printed just once before all the rest of the text.

What I want to do is find the appliance name and print it before each one of the metrics. See below:

Sample input:

Code:
applianceName1
1.0 123 some
5.3 456 random
3.5 78900 string
applianceName2
1.2 1234 another
0.1 023 random
3.0 10 string
applianceName3
0.2 6544676 more
0.9 3543 random
4.1 123 stuff

Expected output:
Code:
applianceName1 1.0 123 some
applianceName1 5.3 456 random
applianceName1 3.5 78900 string
applianceName2 1.2 1234 another
applianceName2 0.1 023 random
applianceName2 3.0 10 string
applianceName3 0.2 6544676 more
applianceName3 0.9 3543 random
applianceName3 4.1 123 stuff

The ending file should, therefore, contain lines with 4 fields each one. Any clues or pointers would be appreciated.

Thanks!
 

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File::Find::Rule::Procedural(3pm)			User Contributed Perl Documentation			 File::Find::Rule::Procedural(3pm)

NAME
File::Find::Rule::Procedural - File::Find::Rule's procedural interface SYNOPSIS
use File::Find::Rule; # find all .pm files, procedurally my @files = find(file => name => '*.pm', in => @INC); DESCRIPTION
In addition to the regular object-oriented interface, File::Find::Rule provides two subroutines for you to use. "find( @clauses )" "rule( @clauses )" "find" and "rule" can be used to invoke any methods available to the OO version. "rule" is a synonym for "find" Passing more than one value to a clause is done with an anonymous array: my $finder = find( name => [ '*.mp3', '*.ogg' ] ); "find" and "rule" both return a File::Find::Rule instance, unless one of the arguments is "in", in which case it returns a list of things that match the rule. my @files = find( name => [ '*.mp3', '*.ogg' ], in => $ENV{HOME} ); Please note that "in" will be the last clause evaluated, and so this code will search for mp3s regardless of size. my @files = find( name => '*.mp3', in => $ENV{HOME}, size => '<2k' ); ^ | Clause processing stopped here ------/ It is also possible to invert a single rule by prefixing it with "!" like so: # large files that aren't videos my @files = find( file => '!name' => [ '*.avi', '*.mov' ], size => '>20M', in => $ENV{HOME} ); AUTHOR
Richard Clamp <richardc@unixbeard.net> COPYRIGHT
Copyright (C) 2003 Richard Clamp. All Rights Reserved. This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. SEE ALSO
File::Find::Rule perl v5.12.4 2011-09-19 File::Find::Rule::Procedural(3pm)
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