Create a bash array from a flat file of whitespaces only. Post: 303012506

Sponsored Content

Operating Systems OS X (Apple) Create a bash array from a flat file of whitespaces only. Post 303012506 by wisecracker on Monday 5th of February 2018 10:16:00 AM

02-05-2018

Registered User

Create a bash array from a flat file of whitespaces only.

Hi guys and gals...
MacBook Pro.
OSX 10.13.2, default bash terminal.
I have a flat file 1920 bytes in size of whitespaces only. I need to put every single whitespace character into a bash array cell.
Below are two methods that work, but both are seriously ugly.
The first one requires that I have newlines after every whitespace, not at all practical.
The second requires hexdump to be called 1920 times.
Speed is not important so hexdump would be a way to go but I am asking you guys if there is a more elegant solution...
(Ignore the 'printf' formatting, this was done for quickness only.)
TIA.

Code:

#!/bin/bash

ifsstr="$IFS"

# Method 1.
IFS=$'\n'

printf "%b" " \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n" > /tmp/ARRAY
echo "Method 1..."
INDEX=0
while read -r line
do
	ARRAY[$INDEX]="$line"
	INDEX=$(( $INDEX + 1 ))
done < /tmp/ARRAY

# Test...
for n in {0..15}
do
	printf "${ARRAY[$n]}$n\n"
done

# Method 2.
IFS="$ifsstr"

printf "                " > /tmp/ARRAY
echo "Method 2..."
for INDEX in {0..15}
do
	ARRAY[$INDEX]=$( hexdump -n1 -s$INDEX -v -e '1/1 "%c"' /tmp/ARRAY )
done

# Test...
for n in {0..15}
do
	printf "${ARRAY[$n]}$n\n"
done

# End of methods...

Results...
Note the leading spaces before the numbers...

Code:

Last login: Mon Feb  5 14:52:58 on ttys000
AMIGA:barrywalker~> cd Desktop/Code/Shell
AMIGA:barrywalker~/Desktop/Code/Shell> ./Space_Array.sh
Method 1...
 0
 1
 2
 3
 4
 5
 6
 7
 8
 9
 10
 11
 12
 13
 14
 15
Method 2...
 0
 1
 2
 3
 4
 5
 6
 7
 8
 9
 10
 11
 12
 13
 14
 15
AMIGA:barrywalker~/Desktop/Code/Shell> _

wisecracker

View Public Profile for wisecracker

Find all posts by wisecracker

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

create array holding characters from sring then echo array.

Hi, I wish to store $string1 in $string1array a character in each array element. Then i wish to echo the entire array to the screen so that it reads as the normal string again. I have been trying with the code below but does not work. Please help... To put string into array: ...

2. Shell Programming and Scripting

csv file to array, match field1, replace in flat file field1 to field2

Hello, i am bit stuck with making script for automatic procedure. Case: Two files. One is flat file, other is csv file. csv file has two column/fields with comma delimited data. Here is what i need (explained way) CSV file: field1 | field2 "hello","byebye" "hello2","byebye2"...

3. Shell Programming and Scripting

How do I create an array from a file using every 3rd line

A file contains the following information shown below. Every ceName has 2 consecutive lines that have to be evaluated, using awk, sed, cut (any common unix tools). Input file: ceName: Node-1 processName: tzMgmt Status: PROCESS_NOT_RUNNING ceName: Node-2 processName: tzMgmt Status:...

4. Infrastructure Monitoring

Possible performance improvement (Bash and flat file)

Hello, I am pretty new to shell scripts and I recently wrote one that seems to do what it should but I am exploring the possibility of improving its performance and would appreciate some help. Here is what it does - Its meant to monitor a bunch of systems (reads in IPs one at a time from a flat...

5. Solaris

Configure disk array in RAID5 and create file system

I'm new to forums, it's my first time posting. I have a sun v490 server. I just installed solaris 10.6, on the local drives. I'm being asked to do the following: For Oracle install I need “oracle” user that belong to “dba” and “oinstall” groups. File system /u01/app/oracle, 10GB (if...

6. Shell Programming and Scripting

how to create flat file delimited by "\002"

I need to create a flat file with columns delimited by "\002" (octal 2) I tried using the simple echo. name="Adam Smith" age=40 address="1 main st" city="New York" echo ${name}"\002"${age}"\002"${address}"\002"${city} > mytmp but it creates a delimiter with different octal...

7. Shell Programming and Scripting

perl: Read array from a flat file

Hello Guru's I want to read an array into a flatfile Please let me know how to do the same So far this the below code use strict; use warnings; open (my $data , '<', $ARGV)|| die "could not open $ARGV:\n$!"; my @array=(<$data>); my @sorted=sort...

8. UNIX for Dummies Questions & Answers

Read a flat file, evaluate and create output. UNIX SCRIPT.

Hi all, I have a flat file as below; 470423495|1||TSA-A000073800||1|||1 471423495|1||TSA-A000073800||5|||5 472423495|1||TSA-A000073800||2|||7 473423495|1||TSA-A000073800||3|||3 I like to create a Unix script. The script have to valuate the last two columns, if the values are...

9. Shell Programming and Scripting

Create a flat file and directory structure

Hi All, is there any work around to generate the file and directory structure like below at left side at Output? and exclude all file except .abc .txt Current Directory structure |-------------files |---------------Share |-----------------dir1 |-----------------dir2...

10. Shell Programming and Scripting

Construct Array from String seperated by different whitespaces

My string variable which gets the output from the result of a database query has values as below: line="2019-09-11 15:17:55 CR1234 anonymous Deployed DR_only Back_APP" I wish to construct an array (my_array) which should have entries as below. Note: 1. The first...

LEARN ABOUT DEBIAN

slamrg.f

slamrg.f(3)							      LAPACK							       slamrg.f(3)

NAME

       slamrg.f -

SYNOPSIS

   Functions/Subroutines
       subroutine slamrg (N1, N2, A, STRD1, STRD2, INDEX)
	   SLAMRG

Function/Subroutine Documentation
   subroutine slamrg (integerN1, integerN2, real, dimension( * )A, integerSTRD1, integerSTRD2, integer, dimension( * )INDEX)
       SLAMRG

       Purpose:

	    SLAMRG will create a permutation list which will merge the elements
	    of A (which is composed of two independently sorted sets) into a
	    single set which is sorted in ascending order.

       Parameters:
	   N1

		     N1 is INTEGER

	   N2

		     N2 is INTEGER
		    These arguements contain the respective lengths of the two
		    sorted lists to be merged.

	   A

		     A is REAL array, dimension (N1+N2)
		    The first N1 elements of A contain a list of numbers which
		    are sorted in either ascending or descending order.  Likewise
		    for the final N2 elements.

	   STRD1

		     STRD1 is INTEGER

	   STRD2

		     STRD2 is INTEGER
		    These are the strides to be taken through the array A.
		    Allowable strides are 1 and -1.  They indicate whether a
		    subset of A is sorted in ascending (STRDx = 1) or descending
		    (STRDx = -1) order.

	   INDEX

		     INDEX is INTEGER array, dimension (N1+N2)
		    On exit this array will contain a permutation such that
		    if B( I ) = A( INDEX( I ) ) for I=1,N1+N2, then B will be
		    sorted in ascending order.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Definition at line 100 of file slamrg.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.1							  Sun May 26 2013						       slamrg.f(3)

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

create array holding characters from sring then echo array.

Discussion started by: rorey_breaker

2. Shell Programming and Scripting

csv file to array, match field1, replace in flat file field1 to field2

Discussion started by: frankie_konin

3. Shell Programming and Scripting

How do I create an array from a file using every 3rd line

Discussion started by: BRH

4. Infrastructure Monitoring

Possible performance improvement (Bash and flat file)

Discussion started by: prafulnama