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Full Discussion: Delete values between 2 patterns
Top Forums Shell Programming and Scripting Delete values between 2 patterns Post 302903058 by alister on Friday 23rd of May 2014 05:56:58 PM
Old 05-23-2014
Quote:
Originally Posted by Don Cragun
There are significant differences between how sed behaves with back references depending on which sed you're using.
Hi, Don. Can you elaborate?

Regards,
Alister

---------- Post updated at 05:56 PM ---------- Previous update was at 05:52 PM ----------

Quote:
Originally Posted by redse171
Hi Akshay Hedge,

I dont have gnu awk. i tried your second codes and it worked perfectly. Thanks
Quote:
Originally Posted by alister
Code:
sed 's/\./\t/3; s/\t.*\t/\t/' file

That isn't portable sed, because \t is primarily a GNU extension.
Quote:
Originally Posted by redse171
Hi Alister,

yes, the file only contains 2 columns and it is tab delimited. and yes, your codes worked great. Thanks
Quote:
Originally Posted by redse171
I am using linux (ubuntu).
Makes sense. Last I heard, default sed on Ubuntu is GNU sed and default AWK is mawk.

Regards,
Alister
 

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LEARN ABOUT XFREE86

ppmtopgm

ppmtopgm(1)						      General Commands Manual						       ppmtopgm(1)

NAME

       ppmtopgm - convert a portable pixmap into a portable graymap

SYNOPSIS

       ppmtopgm [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as  input.  Produces a portable graymap as output.  The output is a "black and white" rendering of the original
       image, as in a black and white photograph.  The quantization formula used is .299 r + .587 g + .114 b.

       Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any  ppm  program  can
       read  pgm  (and	pbm  ) files automatically.  pgmtoppm is for colorizing a pgm file.  Also, see ppmtorgb3 for a different way of converting
       color to gray.  And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate  the  original
       colors, not necessarily a way that looks like a black and white photograph.

QUOTE

       Cold-hearted orb that rules the night
       Removes the colors from our sight
       Red is gray, and yellow white
       But we decide which is right
       And which is a quantization error.

SEE ALSO

       pgmtoppm(1),ppmtorgb3(1),rgb3toppm(1),ppmdist(1),ppm(5),pgm(5)

AUTHOR

       Copyright (C) 1989 by Jef Poskanzer.

								   10 April 2000						       ppmtopgm(1)
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