Copy of array by index value fails Post: 303012758

Sponsored Content

Top Forums Shell Programming and Scripting Copy of array by index value fails Post 303012758 by LMHmedchem on Thursday 8th of February 2018 12:51:51 PM

02-08-2018

Registered User

Copy of array by index value fails

Hello,

I have a complicated situational find and replace that I wrote in bash because I didn't know how to do everything in awk. The code works but is very slow, as expected.

To create my modified file, I am looping through an array that was populated earlier and making some replacements at stored positions.

Code:

# loop through stored record
for ((j=0; j <= $i ; j++)) ; do
   # for the first line, add the new firstline value
   if [[ $j == "0" ]]; then
      echo $new_firstline >> $output_file
   # when the replace line is found, use the substitute value
   elif [[ $j == "$replace_line" ]]; then
      echo $new_name >> $output_file
   # output all other lines as normal
   else
      echo ${line_array[$j]} >> $output_file
   fi
done

This is obviously going to be very slow because of all the file operations. My intent was to write the new file to an array and then print the array at the end.

Code:

# store the record
while read line 
do
   # store line in array
   line_array[$i]="$line"
   # increment counter
   i=$((i+1))
done < $input_file

...
other code to test some things and make new variables
...

# declare an array to store the output
declare -a modified_file
# loop through stored file
for ((j=0; j <= $i ; j++)) ; do
   # for the first line, add the new firstline value to the output array
   if [[ $j == "0" ]]; then
      modified_file=("${modified_file[@]}" "$new_firstline")
   # when the replace line is found, add the substitute value to the output array
   elif [[ $j == "$replace_line" ]]; then
      modified_file=("${modified_file[@]}" "$new_name")
   # output all other lines as normal
   else
      modified_file=("${modified_file[@]}" "${line_array[$j]}")
   fi
done

# print the modified file array to the output file
echo ${modified_file[@]} >> $output_file

This seems like it should be right but all I get when I print modified_file[@] is a series of integers, like it is printing the array index.

What am I doing wrong here? Let me know if I didn't provide enough information.

Thanks,

LMHmedchem

Last edited by LMHmedchem; 02-08-2018 at 01:58 PM..

LMHmedchem

View Public Profile for LMHmedchem

Find all posts by LMHmedchem

10 More Discussions You Might Find Interesting

1. Filesystems, Disks and Memory

why the inode index of file system starts from 1 unlike array index(0)

why do inode indices starts from 1 unlike array indexes which starts from 0 its a question from "the design of unix operating system" of maurice j bach id be glad if i get to know the answer quickly :)

2. UNIX for Dummies Questions & Answers

wh inode index starts from 1 unlike array index (0)

brothers why inode index starts from 1 unlike array inex which starts from 0 its a question from the design of unix operating system of maurice j.bach i need to know the answer urgently...someone help please

3. Shell Programming and Scripting

Problem when assign the array with the string index

I come across the problems when assigning the array in the script below . How to use the array with the 'string index' correctly ? When I assign a new string index , the array elements that are previously assigned are all changed .:eek::eek::eek: $ array=211 $ echo ${array} 211 $...

4. UNIX for Advanced & Expert Users

sql variable as array index

hi folks i am facing problom while trying to access sql variable as array index ina unix shell script....script goes as below.. #!/bin/ksh MAX=3 for elem in alpha beeta gaama do arr=$elem ((x=x+1)) Done SQL_SERVER='servername' /apps/sun5/utils/sqsh -S $SQL_SERVER -U user -P pwd -b -h...

5. Shell Programming and Scripting

awk array index help

$ cat file.txt A|X|20 A|Y|20 A|X|30 A|Z|20 B|X|10 A|Y|40 Summing up $NF based on first 2 fields, $ awk -F "|" 'BEGIN {OFS="|"} { sum += $NF } END { for (f in sum) print f,sum } ' file.txt o/p: A|X|50 A|Y|60 A|Z|20

6. Shell Programming and Scripting

dynamic index for array in while loop

Hi, I'm just trying to use a dynamic index for some array elements that I'm accessing within a loop. Specifically, I want to access an array at variable position $counter and then also at location $counter + 1 and $counter + 2 (the second and third array positions after it) but I keep getting...

7. Shell Programming and Scripting

how to search array and print index in ksh

Hi, I am using KSH shell to do some programming. I want to search array and print index value of the array. Example.. nodeval4workflow="DESCRIPTION ="" ISENABLED ="YES" ISVALID ="YES" NAME="TESTVALIDATION" set -A strwfVar $nodeval4workflow strwfVar=DESCRIPTION=""...

8. Shell Programming and Scripting

build array name based on loop index

Hi, I am new to perl and I have the following query please help here. I have following array variables declaration @pld1 = qw(00 01 02 03 04 05); @pld2 = qw(10 11 12 13 14 15); for(my $k=1;$k<=2;$k++) { //I want here to use @pld1 if $k is 1 // and @pld2 if $k is 2. How to do...

9. Shell Programming and Scripting

Index problem in associate array in awk

I am trying to reformat the table by filling any missing rows. The final table will have consecutive IDs in the first column. My problem is the index of the associate array in the awk script. infile: S01 36407 53706 88540 S02 69343 87098 87316 S03 50133 59721 107923...

10. Shell Programming and Scripting

Associative array index question

I am trying to assign indexes to an associative array in a for loop but I have to use an eval command to make it work, this doesn't seem correct I don't have to do this with regular arrays For example, the following assignment fails without the eval command: #! /bin/bash read -d "\0" -a...

LEARN ABOUT DEBIAN

gchem3d

GCHEM3D(1)						       gnome-chemistry-utils							GCHEM3D(1)

NAME

       gchem3d - a small chemical viewer application

SYNOPSIS

       gchem3d [OPTION(S)...] [FILE...]

DESCRIPTION

       gchem3d is a small chemical viewer application, which can show several chemical file formats.

OPTIONS

       The following options are accepted:

       -b COLOR, --bgcolor=COLOR
	   Use the given color as background color.  COLOR can be one of "black" (default), "white", "#rrggbb" (don't forget to escape the "#"
	   character in the shell).

       -d MODEL, --display3d=MODEL
	   Choose how molecules are displayed.	MODEL can be one of "BallnStick" (default), "SpaceFill".

       -?, --help
	   Show application help options.

       --help-all, --help-*
	   Print all or just a group of help options. These options are not documented here. Instead see gtk-options(7) and gnome-options(7).

       -v, --version
	   Print gchem3d version information.

SEE ALSO

       gnome-options(7), gtk-options(7)

AUTHORS

       Jean Brefort <jean.brefort@normalesup.org>
	   Program author.

       Daniel Leidert <daniel.leidert@wgdd.de>
	   Manpage author.

COPYRIGHT

       Copyright (C) 2002-2007 Jean Brefort
       Copyright (C) 2004-2007 Daniel Leidert

       Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 or any
       later version published by the Free Software Foundation.

gcu 0.12				      $Date: 2009-03-19 10:53:47 +0100 (jeu. 19 mars 2009) $					GCHEM3D(1)