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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 303036770 by jim mcnamara on Wednesday 10th of July 2019 10:50:23 PM
Old 07-10-2019
Using awk -

Code:
$ awk '/^app/ {pre=$0; next}
    length($0) {print pre " " $0 } ' filename > newfile

$ cat newfile
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

It's late so I cannot stay on long to help you figure out how to do it. Otherwise I would not have just blurted out a ho-hum answer.
Next time please tell us your OS and shell so we can give you good help. The idea is to get you able to do all this by yourself....
This User Gave Thanks to jim mcnamara For This Post:
 

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FINDRULE(1)						User Contributed Perl Documentation					       FINDRULE(1)

NAME
findrule - command line wrapper to File::Find::Rule USAGE
findrule [path...] [expression] DESCRIPTION
"findrule" mostly borrows the interface from GNU find(1) to provide a command-line interface onto the File::Find::Rule heirarchy of modules. The syntax for expressions is the rule name, preceded by a dash, followed by an optional argument. If the argument is an opening parenthesis it is taken as a list of arguments, terminated by a closing parenthesis. Some examples: find -file -name ( foo bar ) files named "foo" or "bar", below the current directory. find -file -name foo -bar files named "foo", that have pubs (for this is what our ficticious "bar" clause specifies), below the current directory. find -file -name ( -bar ) files named "-bar", below the current directory. In this case if we'd have omitted the parenthesis it would have parsed as a call to name with no arguments, followed by a call to -bar. Supported switches I'm very slack. Please consult the File::Find::Rule manpage for now, and prepend - to the commands that you want. Extra bonus switches findrule automatically loads all of your installed File::Find::Rule::* extension modules, so check the documentation to see what those would be. AUTHOR
Richard Clamp <richardc@unixbeard.net> from a suggestion by Tatsuhiko Miyagawa COPYRIGHT
Copyright (C) 2002 Richard Clamp. All Rights Reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. SEE ALSO
File::Find::Rule perl v5.18.2 2011-09-19 FINDRULE(1)
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