Pb fonction sh

Bonjour,
je tente d'installer Gparted sur clé USB
http://gparted-livecd.tuxfamily.org/
je suis en root dans le répertoire dans lequel j'ai copié
gparted-livecd-0.3.4-10.iso et set_usb.sh (détaré)

le tuto dit de faire : sh set_usb.sh
mais ça ne marche pas :

[: 16: /tmp/gparted: unexpected operator
$
----------------------------------------------------------------------
$This script is to be run to copy files from GParted-livecd ISO file to usb stick. Run this script from the directory where you downloaded the GParted-livecd ISO file. I assume you have a usb stick formatted as FAT (or FAT32), with at least 55 MO free. You are now going to be asked the path where your usb stick is mounted.
-----------------------------------------------------------------------$
set_usb.sh: 27: function: not found
-en


que faire ?