Function for ".bashrc" that works like HackerTyper

hackertyper.sh

#!/bin/bash
###########################################################################
# Prints source code in screen when pressing any key
# Arguments:
# $1: Extension of the files, without "."
# $2 (optional): Number of characters to print with each keystroke.
#                Default 10
# $3 (optional): Filename or path of files to print
###########################################################################
hackertyper () {
  lines=10
  if [ "$2" ]
  then
    lines=$2    
  fi  
  filename=.
  if [ "$3" ]
  then
    filename=$3 
  fi  
  
  EXT="."$1;
  for F in $(find $filename -iname "*$EXT" -nowarn -readable 2> /dev/null)
  do  
    cat $F | \ 
    while IFS= read -rN $lines C
    do 
      read -s -n 1 <&1 
      echo -n "$C"
    done
    echo
  done
}