Extracting Multiple Lines from a Text File Post: 302583095

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Top Forums Shell Programming and Scripting Extracting Multiple Lines from a Text File Post 302583095 by MrDumbQuestion on Monday 19th of December 2011 02:18:39 PM

12-19-2011

Registered User

Extracting Multiple Lines from a Text File

Hello. I am sorry if this is a common question but through all my searching, I haven't found an answer which matches what I want to do.

I am looking for a sed command that will parse through a large text file and extract lines that start with specific words (which are repeated throughout the file).

Example Text
Line 1: This is example line 1
Line 2: This is example line 2
Line 3: This is example line 3
Line 4: This is example line 4
Line 5: This is example line 5
<blankline>
Line 1: This is example line 1
Line 2: This is example line 2
Line 3: This is example line 3
Line 4: This is example line 4
Line 5: This is example line 5
<blankline>
Line 1: This is example line 1
Line 2: This is example line 2
Line 3: This is example line 3
Line 4: This is example line 4
Line 5: This is example line 5
etc.

Output Needed (in a new text file):
Line 2: This is example line 2
Line 4: This is example line 4
<blankline>
Line 2: This is example line 2
Line 4: This is example line 4
<blankline>
Line 2: This is example line 2
Line 4: This is example line 4
etc.

I tried grep but couldn't get the command to understand the separate lines.

Again, sorry if this is an obvious answer but finding it fails me.
Thanks.

MrDumbQuestion

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LEARN ABOUT DEBIAN

geometry::primitive::line

Geometry::Primitive::Line(3pm)				User Contributed Perl Documentation			    Geometry::Primitive::Line(3pm)

NAME

       Geometry::Primitive::Line - A Line

DESCRIPTION

       Geometry::Primitive::Line represents a straight curve defined by two points.

SYNOPSIS

	 use Geometry::Primitive::Line;

	 my $line = Geometry::Primitive::Line->new();
	 $line->start($point1);
	 $line->end($point2);

ATTRIBUTES

   end
       Set/Get the end point of the line.

   start
       Set/Get the start point of the line.

METHODS

   new
       Creates a new Geometry::Primitive::Line

   contains_point
       Returns true if the supplied point is 'on' the line.  Accepts either a point object or an x y pair.

   grow
       Does nothing, as I'm not sure how.  Patches or hints welcome.

   is_parallel ($other_line)
       Returns true if the supplied line is parallel to this one.

   is_perpendicular ($other_line)
       Returns true if the supplied line is perpendicular to this one.

   length
       Get the length of the line.

   point_end
       Get the end point.  Provided for Shape role.

   point_start
       Get the start point.  Provided for Shape role.

   scale
       Does nothing at the moment.

   slope
       Get the slope of the line.

   to_string
       Guess!

   y_intercept
       Returns the Y intercept of this line.

AUTHOR

       Cory Watson <gphat@cpan.org>

COPYRIGHT &; LICENSE
       You can redistribute and/or modify this code under the same terms as Perl itself.

perl v5.10.1							    2010-01-10					    Geometry::Primitive::Line(3pm)