#!/bin/bash

# @author  Thiago Jose Lucas
# @since   18-02-2013
# @version v1.0

read -p "Entre com a string: " STRING
CHARS=$(echo $STRING|wc -c)
CHARS_DIV=$(($CHARS/2))
let CHARS--

seq 1 $CHARS_DIV | while read POSITION ;do
   printf "$(echo $STRING | cut -c$POSITION)"
   printf "$(echo $STRING | cut -c$(($POSITION+$CHARS_DIV)))"
done

echo