retaining only the second line with a pattern and deleting all others Post: 302568919

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Top Forums Shell Programming and Scripting retaining only the second line with a pattern and deleting all others Post 302568919 by goodbenito on Friday 28th of October 2011 03:42:33 PM

10-28-2011

Registered User

retaining only the second line with a pattern and deleting all others

Hi,

I have a file:

5 T1AxialPremosaic ok 512 448 23 1 284000-000005-000001.dcm
6 T2_SPACE ok 256 256 176 1 465000-000006-000001.dcm
7 FLAIRmosaic ok 512 432 23 1 748000-000007-000001.dcm
8 T2_SPACE ok 256 256 1 171000-000008-000001.dcm
9 T2_SPACE ok 256 256 1 218000-000009-000001.dcm
32 T1AxialPostmosaic ok 512 448 23 1 836000-000032-000001.dcm
33 MEMPRAGE ok 256 256 704 1 408000-000033-000001.dcm
34 MEMPRAGE ok 256 256 176 1 767000-000034-000001.dcm
35 MEMPRAGE ok 256 256 1 380000-000035-000001.dcm
36 MEMPRAGE ok 256 256 1 178000-000036-000001.dcm

...and I would like to retain only the second line with the pattern MEMPRAGE (preferably using just RAGE and in a case-insensitive manner). I've tried different things with awk:

Code:

awk 'tolower($0) ~ /rage/&&c++>0 {next} 1' inputfile

but for this guy (above), I don't know how to keep only the second occurrence. I've also tried various plays on this one-liner:

Code:

awk '(substr($0,8,4)!="RAGE")||(NR<1)' inputfile

But this isn't quite right either. The bottom line is that I don't understand awk, sed or grep well enough to get it done quickly. Any help would be greatly appreciated. Thanks.

goodbenito

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LEARN ABOUT DEBIAN

hdftor8

HDFTOR8(1)						      General Commands Manual							HDFTOR8(1)

NAME

       hdftor8 - extract 8-Bit raster images and palettes from HDF file

SYNOPSIS

       hdftor8 hdf-file [-i] [-v] [-r raster-image-file] [-p pallette-file]

DESCRIPTION

       hdftor8 extracts the raster images and/or palettes from an HDF file and stores them in one file that contains the raster image data and an-
       other that contains the palette data.

       The names given for the raster image and palette files are interpreted by hdftor8 as follows: For each raster image file, the file name	is
       given  the extension ".#.@.%", where "#" represents the raster image number from the HDF file, "@" represents the x-dimension of the raster
       image, and "%" represents the y-dimension of the raster image. For each palette file, the file name is given the extensions ".#", where "#"
       represents the palette number from the HDF format file.

       If no name is given for the raster image file, the default name "img.#.@.%" is assigned, where "#", "@", and "%" are as defined in the pre-
       ceding paragraph. The default name for a palette file is "pal.#".

OPTIONS

       -i     Execute the program in interactive mode.

       -v     Execute in verbose mode. Display diagnostic messages during the session.

       -r raster-image-file
	      Specify the name of the raster image file.

       -p pallette-file
	      Specify the name of the palette file.

EXAMPLES

       A file named "denm.hdf" contains three 512 x 256 raster images and three palettes. To store these images and palettes  in  separate  raster
       image and palette files, use the following hdftor8 command:

	       hdftor8 denm.hdf

       Six files are created, named "img1.512.256", "img2.512.256", "img3.512.256", "pal.1", "pal.2", and "pal.3".

SEE ALSO

       r8tohdf(1), hdf(5)

								 November 6, 1999							HDFTOR8(1)