Make and create Live USB Linux for Mac? How?
Download the desired .img file
Open a Terminal (under Utilities)

If you have and .iso file, you could convert to .img with the command hdiutil convert -format UDRW -o ~/path/to/target.img ~/path/to/source.iso.

Run diskutil list to get the current list of devices
Insert your flash media
Run diskutil list again and determine the device node assigned to your flash media (e.g. /dev/disk2)
Run diskutil unmountDisk /dev/diskN
Execute sudo dd if=/path/to/downloaded.img of=/dev/diskN bs=1m
Run diskutil eject /dev/diskN and remove your flash media when the command completes


Restart your Mac and press &#x2325;/⌘ key while the Mac is restarting to choose the USB stick.