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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 303025732 by mkathi on Saturday 10th of November 2018 08:45:48 PM
Old 11-10-2018
Hello you are right

I have to pass the input as arrays yes and i did make a typo near the echo

yes the echo at the end is outside the loop so it will only print out the last row i think

issue is even if i pass the target as variable the code is only picking the first value passed generating the md5 and outputting the md5 for that line. I am trying to figure out how can i loop through all the columns passed inside the array and concatenate them using, and then calculate their md5 and then write it back to the file as a new column.

I know its a strange requirement Please point me to the write direction

I m trying something like this with no avail


Code:
#!/usr/bin/sh

target=("id,name")  
target_idx=()   # the column number of that field
{
  # reading header.
for i in $(echo $target | sed "s/,/ /g");do # trying to pass the comma seperated values inside target variable
  IFS=, read -r -a header
  for idx in "${!header[@]}"; do  # and look for the target field in it
    [[ ${header[$idx]} = $target ]] && { target_idx=$idx; break; }
  done
 done
  # then, iterate over lines
  while IFS=, read -r -a line; do
    a=$(echo -n ${line[$target_idx]}|md5sum)
    echo "$line"
  done
}

------ Post updated at 01:45 AM ------

Just a thought may be i should change my thinking. Just throwing it out i still did not figure out how to write the code but i may have a starting point

step one is if i can concatenate all the column names i send as a parameter to the script and then apply md5 function on it and then store the result of the output in a column in the end does this make any sense.
 

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LEARN ABOUT DEBIAN

metalink

METALINK(1)						      General Commands Manual						       METALINK(1)

NAME

       metalink -- commandline metalink generator

SYNOPSIS

       metalink [input files]  [ < mirror list]

DESCRIPTION

       This manual page documents briefly the metalink command.

       This manual page was written for the Debian distribution because the original program does not have a manual page.

       metalink allows you to generate metalinks from a list of mirrors and a collection of files. The files are hashed and the resulting metalink
       is generated on the stdout.

OPTIONS

       These programs follow the usual GNU command line syntax, with long options starting with  two  dashes  (`-').   A  summary  of  options	is
       included below.

       -h	    --help
		 Produce a help message

		 --version
		 Print out the name and version.

		 --md5
		 Generate metalink from md5sum file(s).

		 --addpath path
		 Append a path to the mirrors ('/' is not checked)

		 --headerfile arg
		 Include file after the root element declaration.

		 --nomirrors
		 Don't read mirrors from stdin

		 --hashlist
		 List hashes only (implies nomirrors)

		 --desc arg
		 Add metalink description

		 -d arg
		 Include given digest

		 --mindigests
		 Include: md5 sha1

		 --somedigests
		 Include: md5 sha1 ed2k

		 --alldigests
		 Include all possible digests

       Supported algorithms are (-d options): md4 md5 sha1 sha256 sha384 sha512 rmd160 tiger crc32 ed2k gnunet sha1pieces

       Mirror lists are single line definitions according to: [location [preference] [type] % ] mirror base url

EXAMPLES

       http://example.com/ as a mirror: echo http://example.com | metalink -d md5 -d sha1 *

       http://example.com/ as a mirror with preference and location: echo us 10 % http://example.com | metalink -d md5 -d sha1 *

       http://example.com/ as a mirror with preference only: echo 0 10 % http://example.com | metalink -d md5 *

AUTHOR

       This manual page was written by A. Bram Neijt bneijt@gmail.com for the Debian system (but may be used by others).  Permission is granted to
       copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 any later  version  published	by
       the Free Software Foundation.

       On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL.

																       METALINK(1)
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