Convert pdf to text and read it out loud

gistfile1.sh

#!/bin/bash

if [[ "$1" != "" ]]; then
  pdf_file="$1"
  shift

  rm /tmp/pdf_file.txt >> /dev/null 2>&1
  if [[ ! -f $(which pdftotext) ]]; then
    echo "You do not have xpdf installed, please install it to convert pdfs to text..."
    exit 1
  fi

  pdftotext "$@" "$pdf_file" /tmp/pdf_file.txt >> /dev/null 2>&1 | echo "Converting $pdf_file..."
  if [[ -f "/tmp/pdf_file.txt" ]]; then
    echo -n "Would you like to be read the output using espeak?"
    read -t 10 read_pdf
    if [[ "$read_pdf" == "yes" ]] || [[ "$read_pdf" == "y" ]]; then
      clear
      if [[ -f $(which espeak-gui) ]]; then
        espeak-gui /tmp/pdf_file.txt >> /dev/null 2>&1
      elif [[ -f $(which espeak) ]]; then
        espeak -f /tmp/pdf_file.txt >> /dev/null 2>&1
      else
        # Assume OS X because most Linux distros have espeak installed by default
        say -f /tmp/pdf_file.txt >> /dev/null 2>&1
      fi
    else
      clear
      cat /tmp/pdf_file.txt | less
    fi
  else
    echo "There was an error while converting to text..."
    exit 1
  fi
else
  echo "Nothing to read..."
  exit 1
fi