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Full Discussion: Substr
Top Forums UNIX for Dummies Questions & Answers Substr Post 302950468 by mjf on Friday 24th of July 2015 10:10:38 PM
Old 07-24-2015
Xterra,

Quote:
Is there a better way to achieve this task using awk?
What do you mean by better way? Most efficient? The shortest or most cryptic? Your solution appears to work based on your input/output after implementing #2 and #4 in my last post and is readable. Surely there are other alternatives on how to do it with awk or other commands/utilities but without further clarification on the requirements or what you mean by a better way, it's hard for us to make suggestions.

Your requirement
Quote:
if the sequence in the even line is shorter than 7 , both, the odd line and "id" should be removed
does not match your desired output results as the below line on your input file does not meet this condition (i.e. it's not shorter than 7) and should therefore appear in the output file (your output file does not have it).

Quote:
>GHL8OVD01CMQVT SHORT
TTGATGT
btw...Editing/correcting your prior posts based on suggestions made in subsequent posts makes it difficult to follow the history of the posts.
 

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LEARN ABOUT OSX

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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