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Full Discussion: How to delete all lines before a particular pattern when the pattern is defined in a variable?
Top Forums Shell Programming and Scripting How to delete all lines before a particular pattern when the pattern is defined in a variable? Post 303004035 by disedorgue on Monday 25th of September 2017 03:27:23 PM
Old 09-25-2017
Hi,
with your example file:
Code:
$ cat /tmp/bob2 
Line 1 a
Line 22
Line 33
Line 1 b
Line 22
Line 1 c
Line 4
Line 5
$ XX="Line 1"
$ awk -vRS="$XX(\n| [^\n]+\n)" -vORS="" 'END{print}' /tmp/bob2
Line 4
Line 5
$ XX="Line 2"
$ awk -vRS="$XX(\n| [^\n]+\n)" -vORS="" 'END{print}' /tmp/bob2
Line 1 a
Line 22
Line 33
Line 1 b
Line 22
Line 1 c
Line 4
Line 5
$ XX="Line 22"
$ awk -vRS="$XX(\n| [^\n]+\n)" -vORS="" 'END{print}' /tmp/bob2
Line 1 c
Line 4
Line 5

Regards.
 

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LEARN ABOUT DEBIAN

perl::critic::policy::valuesandexpressions::prohibitimplicitnewl

Perl::Critic::Policy::ValuesAndExpressions::ProhibitImplUserNContributed)Perl::Critic::Policy::ValuesAndExpressions::ProhibitImplicitNewlines(3pm)

NAME

       Perl::Critic::Policy::ValuesAndExpressions::ProhibitImplicitNewlines - Use concatenation or HEREDOCs instead of literal line breaks in
       strings.

AFFILIATION

       This Policy is part of the core Perl::Critic distribution.

DESCRIPTION

       Strings with embedded line breaks are hard to read.  Use concatenation or HEREDOCs instead.

	   my $foo = "Line one is quite long
	   Line two";					 # Bad

	   my $foo = "Line one is quite long
Line two"; # Better, but still hard to read

	   my $foo = "Line one is quite long
"
	       . "Line two";				   # Better still

	   my $foo = <<'EOF';				 # Use heredoc for longer passages
	   Line one is quite long
	   Line two
	   Line three breaks the camel's back
	   EOF

CONFIGURATION

       This Policy is not configurable except for the standard options.

AUTHOR

       Chris Dolan <cdolan@cpan.org>

CREDITS

       Initial development of this policy was supported by a grant from the Perl Foundation.

COPYRIGHT

       Copyright (c) 2007-2011 Chris Dolan.  Many rights reserved.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.  The full text of this license
       can be found in the LICENSE file included with this module.

perl v5.14.2							    2012-Perl::Critic::Policy::ValuesAndExpressions::ProhibitImplicitNewlines(3pm)
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