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Top Forums Shell Programming and Scripting sed Range Pattern and 2 lines before Start Pattern Post 302960204 by y2jacky on Thursday 12th of November 2015 04:11:29 AM
Old 11-12-2015
sed Range Pattern and 2 lines before Start Pattern

Hi all,

I have been searching all over Google but I am unable to find a solution for a particular result that I am trying to achieve.

Consider the following input:

Code:
1
2
3
4
5
B4Srt1--Variable-0000
B4Srt2--Variable-1111
Srt
6
7
8
9
10
End
11
12
13
B4Srt1-Variable-12361
B4Srt2-Variable-68931
Srt
14
15
End


I would like to extract 2 lines (these 2 lines can be different) above "Srt" (fixed) till "End"(fixed).

Desired output:

Code:
B4Srt1--Variable-0000
B4Srt2--Variable-1111
Srt
6
7
8
9
10
End
B4Srt1-Variable-12361
B4Srt2-Variable-68931
Srt
14
15
End

I understand that using the sed range pattern can help me on this.

Code:
sed -n '/Srt/,/End/' filename

However, the challenge that I am facing is that only "Srt" is fixed while the two lines above "Srt" always change, therefore I am unable to use them as a pattern. How do I modify the sed command such that I can include the two lines above "Srt", somewhat like grep -B2?

Please help on this.

Last edited by Don Cragun; 11-12-2015 at 05:25 AM.. Reason: Add CODE and ICODE tags.
 

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PPI::Statement::Variable(3)				User Contributed Perl Documentation			       PPI::Statement::Variable(3)

NAME
PPI::Statement::Variable - Variable declaration statements SYNOPSIS
# All of the following are variable declarations my $foo = 1; my ($foo, $bar) = (1, 2); our $foo = 1; local $foo; local $foo = 1; LABEL: my $foo = 1; INHERITANCE
PPI::Statement::Variable isa PPI::Statement::Expression isa PPI::Statement isa PPI::Node isa PPI::Element DESCRIPTION
The main intent of the "PPI::Statement::Variable" class is to describe simple statements that explicitly declare new local or global variables. Note that this does not make it exclusively the only place where variables are defined, and later on you should expect that the "variables" method will migrate deeper down the tree to either PPI::Statement or PPI::Node to recognise this fact, but for now it stays here. METHODS
type The "type" method checks and returns the declaration type of the statement, which will be one of 'my', 'local', 'our', or 'state'. Returns a string of the type, or "undef" if the type cannot be detected (which is probably a bug). variables As for several other PDOM Element types that can declare variables, the "variables" method returns a list of the canonical forms of the variables defined by the statement. Returns a list of the canonical string forms of variables, or the null list if it is unable to find any variables. symbols Returns a list of the variables defined by the statement, as PPI::Token::Symbols. TO DO
- Write unit tests for this SUPPORT
See the support section in the main module. AUTHOR
Adam Kennedy <adamk@cpan.org> COPYRIGHT
Copyright 2001 - 2011 Adam Kennedy. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of the license can be found in the LICENSE file included with this module. perl v5.18.2 2011-02-25 PPI::Statement::Variable(3)
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