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

lines

lines(3U)						    InterViews Reference Manual 						 lines(3U)

NAME

       Point, Line, MultiLine, S_MultiLine, SF_MultiLine - structured graphics classes for points, lines, and open polygons

SYNOPSIS

       #include <Unidraw/Graphic/lines.h>

DESCRIPTION

       Point  and  Line  are subclasses of Graphic that draw a point and a line, respectively.	MultiLine is a Vertices subclass that serves as an
       abstract base class for open polygons: S_MultiLine is a MultiLine subclass for stroked open polygons,  while  SF_MultiLine  is  a  stroked-
       filled open polygon.  Point, Line, and S_MultiLine store a PSBrush, while SF_MultiLine also stores a PSPattern.

POINT PUBLIC OPERATIONS

       Point(Coord x, Cord y, Graphic* = nil)
	      Construct a Point object, optionally supplying a graphic from which to obtain an initial set of graphics state.

       void GetOriginal(Coord&, Coord&)
	      Return the coordinates supplied in the constructor.

LINE PUBLIC OPERATIONS

       Line(Coord x0, Cord y0, Coord x1, Coord y1, Graphic* = nil)
	      Construct a Line object, optionally supplying a graphic from which to obtain an initial set of graphics state.

       void GetOriginal(Coord& x0, Coord& y0, Coord& x1, Coord& y1)
	      Return the line's endpoints as supplied in the constructor.

MULTILINE PROTECTED OPERATIONS

       MultiLine(Coord* x, Coord* y, int count, Graphic* = nil)
	      MultiLine's constructor is protected to prevent instantiation of the abstract base class.  The parameters are passed directly to the
	      Vertices constructor.

S_MULTILINE PUBLIC OPERATIONS
       S_MultiLine(Coord* x, Coord* y, int count, Graphic* = nil)
	      Construct an S_MultiLine object, optionally supplying a graphic from which to obtain an initial set of graphics state.

SF_MULTILINE PUBLIC OPERATIONS
       SF_MultiLine(Coord* x, Coord* y, int count, Graphic* = nil)
	      Construct an SF_MultiLine object, optionally supplying a graphic from which to obtain an initial set of graphics state.

SEE ALSO

       Graphic(3U), Vertices(3U), pspaint(3U)

Unidraw 							  2 February 1991							 lines(3U)