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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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SCRIPT(1)						    BSD General Commands Manual 						 SCRIPT(1)

NAME
script -- make typescript of terminal session SYNOPSIS
script [-adfpqr] [-c command] [file] DESCRIPTION
script makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1). If the argument file is given, script saves all dialogue in file. If no file name is given, the typescript is saved in the file typescript. Option: -a Append the output to file or typescript, retaining the prior contents. -c command Run the named command instead of the shell. Useful for capturing the output of a program that behaves differently when associated with a tty. -d When playing back a session with the -p flag, don't sleep between records when playing back a timestamped session. -f Flush output after each write. This is useful for watching the script output in real time. -p Play back a session recorded with the -r flag in real time. -q Be quiet, and don't output started and ended lines. -r Record a session with input, output, and timestamping. The script ends when the forked shell exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not set) for the C-shell, csh(1)). Certain interactive commands, such as vi(1), create garbage in the typescript file. script works best with commands that do not manipulate the screen, the results are meant to emulate a hardcopy terminal. ENVIRONMENT
The following environment variable is used by script: SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most shells set this variable automatically). SEE ALSO
csh(1) (for the history mechanism). HISTORY
The script command appeared in 3.0BSD. BUGS
script places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects. BSD
October 17, 2009 BSD
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