Convert your ISO image into a Mac native disk image:
hdiutil convert -format UDRW -o my-file my-file.iso
Insert a USB stick into your Mac and get the device path by running:
In my case it’s /dev/disk2. Please take extra care when identifying the USB disk, as you might otherwise delete your entire harddrive!
Unmount the USB disk (do not eject):
diskutil unmountDisk /dev/disk2
Write the converted ISO file to the USB disk:
sudo dd if=my-file.dmg of=/dev/rdisk2 bs=1m
We use /dev/rdisk2 here, as opposed to /dev/disk2 when we unmounted, because it gives access the the raw device and makes the writing faster.
Now eject the USB disk:
diskutil eject /dev/disk2