Login or Register to Ask a Question and Join Our Community

Sponsored Content
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.
 

10 More Discussions You Might Find Interesting

1. Programming

reallocating structures dynamically in functions

I've recently started using structures, but I am having problems in allocating the structure dynamically. In the code below if i allocate the structure in the main program it works fine, and i get the expected output. However if i use the function rper below to increase the size of the structure i... (0 Replies)
Discussion started by: cezaryn
0 Replies

2. Shell Programming and Scripting

Managing dynamically multiple shell

I want to launch some shell scripts. I would have the possibility to change the number of shell scripts launched dynamically by modifying a variable, or a configuration file. For example, I start to launch 4 scripts at the same time, and after that, by modifying a variable, 6 scripts are... (0 Replies)
Discussion started by: gonzo38
0 Replies

3. Shell Programming and Scripting

Shell script dynamically case in VAR

Hallo, I am working on a kdialog. This shall be able to load the required commands from a .conf file. First step runs good by loading the entries (selectabel entries) in a variable: MIRRORSELECT=$(kdialog --radiolist "Select your nearest mirror" $VAR1) The kdialog is accordingly correct... (2 Replies)
Discussion started by: ACTGADE
2 Replies

4. Shell Programming and Scripting

how to create the files dynamically in c shell script

how can i CREATE a txt file dynamically in c shell: for instance: #! /bin/csh for each i (*) cat>file$i.txt for each j do .... (1 Reply)
Discussion started by: jdsignature88
1 Replies

5. Shell Programming and Scripting

How to run multiple functions in Background in UNIX Shell Scripting?

Hi, I am using ksh , i have requirement to run 4 functions in background , 4 functions call are available in a case that case is also in function, i need to execute 1st function it should run in background and return to case and next i will call 2nd function it should run in background and... (8 Replies)
Discussion started by: karthikram
8 Replies

6. Shell Programming and Scripting

Creating IN list in PLSQL script dynamically by using shell script

Hi all, I have a PLSQL script which has a IN list where it takes some ids as input. For example SELECT * FROM EMPLOYEE WHERE EMPLOYEE_ID IN (comma separated list ) I want to run this quest inside a shell script but I would like to prepare the IN list dynamically where the employee ids... (1 Reply)
Discussion started by: LoneRanger
1 Replies

7. Shell Programming and Scripting

Read Two Columns - Apply Condition on Six other columns

Hello All, Here is my input univ1 chr1 100 200 - GeneA 500 1 0 0.1 0.2 0.3 0.4 0.5 univ1 chr1 100 200 - GeneA 600 1 0 0.0 0.0 0.0 0.0 0.1 univ1 chr1 100 200 - GeneA 700 1 0 0.4 0.4 ... (2 Replies)
Discussion started by: jacobs.smith
2 Replies

8. Shell Programming and Scripting

How can I apply 'date' command to specific columns, in a BASH script?

Hi everyone, I have a situation in which I have multiple (3 at last count) date columns in a CSV file (, delim), which need to be changed from: January 1 2017 (note, no comma after day) to: YYYY-MM-DD So far, I am able to convert a date using: date --date="January 12, 1990" +%Y-%m-%d ... (7 Replies)
Discussion started by: richardsantink
7 Replies

9. UNIX for Beginners Questions & Answers

How to apply the update statement in multiple servers on multiple dbs at a time .?

Hi , Can any please help the below requirement on all multiple servers and multiple dbs. update configuration set value='yes' ;1) the above statement apply on 31 Databases at a time on different Ip address eg : 10.104.1.12 (unix ip address ) the above ip box contains 4 db's eg : db... (2 Replies)
Discussion started by: venkat918
2 Replies

10. UNIX for Beginners Questions & Answers

How to print multiple required columns dynamically in a file using the header name?

Hi All, i am trying to print required multiple columns dynamically from a fie. But i am able to print only one column at a time. i am new to shell script, please help me on this issue. i am using below script awk -v COLT=$1 ' NR==1 { for (i=1; i<=NF; i++) { ... (2 Replies)
Discussion started by: balu1234
2 Replies

LEARN ABOUT FREEBSD

atf-sh

ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME

     atf-sh [-s shell] -- interpreter for shell-based test programs

SYNOPSIS

     atf-sh script

DESCRIPTION

     atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library.

     atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL.  atf-sh executes the inter-
     preter, loads the atf-sh(3) library and then runs the script.  You must consider atf-sh to be a POSIX shell by default and thus should not
     use any non-standard extensions.

     The following options are available:

     -s shell	  Specifies the shell to use instead of the value provided by ATF_SHELL.

ENVIRONMENT

     ATF_LIBEXECDIR    Overrides the builtin directory where atf-sh is located.  Should not be overridden other than for testing purposes.
     ATF_PKGDATADIR    Overrides the builtin directory where libatf-sh.subr is located.  Should not be overridden other than for testing purposes.
     ATF_SHELL	       Path to the system shell to be used in the generated scripts.  Scripts must not rely on this variable being set to select a
		       specific interpreter.

EXAMPLES

     Scripts using atf-sh(3) should start with:

	   #! /usr/bin/env atf-sh

     Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh.  Instead, you have to hardcode
     the path to atf-sh in the script and then use the -s option afterwards as a single parameter:

	   #! /path/to/bin/atf-sh -s/bin/bash

ENVIRONMENT

     ATF_SHELL	  Path to the system shell to be used in the generated scripts.

SEE ALSO

     atf-sh(3)

BSD
								September 27, 2014							       BSD
All times are GMT -4. The time now is 06:29 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy