How to create a bootable USB Stick from a ISO file.
First you have to convert the iso file to a img file. This command will do the work.
hdiutil convert -format UDRW -o /path/to/source /path/to/destination
Then you have to find the attached USB device
diskutil list
Now search for device (for example: /dev/disk3)
and eject this device
diskutil unmountDisk /dev/diskN
Now you can start the copy process (be careful that you choose the right device, all datas on this device will be deleted!!)
sudo dd if=/path/to/source.img of=/dev/diskN bs=1m
Don’t forget to eject the device again before unplugging
diskutil unmountDisk /dev/diskN