How to make an installation USB for Linux or other OS in Mac OS X

Step1: Download the image(iso) file from the Internet.

Step2: Open a Terminal(the following command are all completed in a terminal)

Step3: Trun .iso file into .img file by hdiutil convert -format UDRW -o ~/path/to/target.img ~/path/from/src.iso(The file created may end with .dmg)

Step4: diskutil list to obtain the devices mounted.

Step5: Insert your USB.

Step6: diskutil list to see which is added(/dev/diskN).

Step7: diskutil unmountDisk /dev/diskN to unmount USB

Step8: sudo dd if=/path/to/target.img of=/dev/rdiskN bs=1m to write the installation file into the USB

Step9: diskutil eject /dev/diskN to eject your USB.