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Full Discussion: Select / Print odd-even elements of an array
Top Forums Shell Programming and Scripting Select / Print odd-even elements of an array Post 302979931 by Don Cragun on Monday 22nd of August 2016 02:37:05 AM
Old 08-22-2016
Hi H squared,
That isn't the way arrays work. Reading an array creates elements based on field splitting; not arrays of individual characters. But, both recent versions of bash and 1993 or later versions of ksh support extensions to the standard providing simplified for loops and substring variable expansions that do what is needed here:
Code:
#!/bin/bash
{	read -r n
	printf 'Expecting to process %s lines...\n' "$n"
	while IFS= read -r text
	do	printf 'Processing text: "%s"\n' "$text"
		for((i = 0; i < ${#text}; i += 2))
		do	printf '%s' "${text:$i:1}"
		done
		printf ' '
		for((i = 1; i < ${#text}; i += 2))
		do	printf '%s' "${text:$i:1}"
		done
		echo
	done
} < file

which with the input you showed us in a file named file produces the output:
Code:
Expecting to process 2 lines..
Processing text: "Haider"
Hie adr
Processing text: "Bash"
Bs ah

This User Gave Thanks to Don Cragun For This Post:
H squared
 

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LEARN ABOUT ULTRIX

dwtstextreplace

DwtSTextReplace(3Dwt)													     DwtSTextReplace(3Dwt)

Name
       DwtSTextReplace - Replaces a portion of the current text string in the simple text widget or inserts a new substring in the text.

Syntax
       void DwtSTextReplace(widget, from_pos, to_pos, value)
	    Widget widget;
	    int from_pos, to_pos;
	    DwtCompString value;

Arguments
       widget	 Specifies the ID of the simple text widget whose text string you want to replace.

       from_pos  Specifies the beginning character position within the text string marking the text being replaced.

       to_pos	 Specifies the last character position within the text string marking the text being replaced.

       value	 Specifies the text to replace part of the current text in the simple text widget.

Description
       The  DwtSTextReplace  function  replaces  part of the text string in the simple text widget.  Within the window, the positions are numbered
       starting from 0 and increasing sequentially.  For example, to replace the second and third characters in the string, from_pos should  be  1
       and to_pos should be 3.	To insert a string after the fourth character, from_pos and to_pos should both be 4.

See Also
       DwtSText(3Dwt),  DwtSTextGetString(3Dwt),  DwtSTextGetEditable(3Dwt),  DwtSTextSetEditable(3Dwt), DwtSTextGetMaxLength(3Dwt), DwtS-
       TextSetMaxLength(3Dwt), DwtSTextSetSelection(3Dwt), DwtSTextClearSelection(3Dwt), DwtSTextGetSelection(3Dwt)
       Guide to the XUI Toolkit: C Language Binding
       Guide to the XUI Toolkit Intrinsics: C Language Binding

															     DwtSTextReplace(3Dwt)
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