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Full Discussion: Shell script to apply functions to multiple columns dynamically
Top Forums Shell Programming and Scripting Shell script to apply functions to multiple columns dynamically Post 303025757 by RudiC on Sunday 11th of November 2018 05:30:03 PM
Old 11-11-2018
Quote:
Originally Posted by mkathi
Yes thank-you, you are right I should be more careful with the cases
Yes.

Quote:
Also can the last line MCOL="ID,NAME" be parameterized example . . . and call the script like sh myscript.sh "ID,NAME"(I think it is a silly question but never the less I am asking)
How about just trying and using MCOL="$1"? The syntax you used is called "command substitution".
Quote:
Also I am trying to understand your code line by line could you point me how debug this code I am not asking you to explain line by line but can you pls point me towards the direction for me to better understand the code.
Thanks.
When operating on the first data line, I collect the target column numbers as indices into an array. For all remaining lines, I assemble these column values separated by commas into a TMP variable, execute echo ... | md5sum on it, getline the result into a variable, and, after some massaging, print the desired outout line.
Aside, if your file has more lines than awk allows for open files, you'd need to close the system calls after each use...
 

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LEARN ABOUT FREEBSD

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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