This how-to describes the steps required for burning an ISO file using linux command lines.
The easiest way to burn an ISO file onto a CD is to use cdrecord. These operation will have to be done with root privileges (use sudo if needs be).
First find the address of the CD writer:
This will show the devices connected to your syste. The SCSI address of each device is the three numbers in the left most column, say 0,3,0 . Now you can burn the CD with:
cdrecord dev=0,3,0 -v SCLive-1.0.iso