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

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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> _

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class::mop::method::wrapped

Class::MOP::Method::Wrapped(3)				User Contributed Perl Documentation			    Class::MOP::Method::Wrapped(3)

NAME

       Class::MOP::Method::Wrapped - Method Meta Object for methods with before/after/around modifiers

VERSION

       version 2.0604

DESCRIPTION

       This is a Class::MOP::Method subclass which implements before, after, and around method modifiers.

METHODS

   Construction
       Class::MOP::Method::Wrapped->wrap($metamethod, %options)
	   This is the constructor. It accepts a Class::MOP::Method object and a hash of options.

	   The options are:

	   o	   name

		   The method name (without a package name). This will be taken from the provided Class::MOP::Method object if it is not provided.

	   o	   package_name

		   The package name for the method. This will be taken from the provided Class::MOP::Method object if it is not provided.

	   o	   associated_metaclass

		   An optional Class::MOP::Class object. This is the metaclass for the method's class.

       $metamethod->get_original_method
	   This returns the Class::MOP::Method object that was passed to the constructor.

       $metamethod->add_before_modifier($code)
       $metamethod->add_after_modifier($code)
       $metamethod->add_around_modifier($code)
	   These methods all take a subroutine reference and apply it as a modifier to the original method.

       $metamethod->before_modifiers
       $metamethod->after_modifiers
       $metamethod->around_modifiers
	   These methods all return a list of subroutine references which are acting as the specified type of modifier.

AUTHOR

       Moose is maintained by the Moose Cabal, along with the help of many contributors. See "CABAL" in Moose and "CONTRIBUTORS" in Moose for
       details.

COPYRIGHT AND LICENSE

       This software is copyright (c) 2012 by Infinity Interactive, Inc..

       This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

perl v5.16.2							    2012-09-19					    Class::MOP::Method::Wrapped(3)

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