cat /dev/sr0 > image.iso

dd if=/dev/cdrom bs=blocksize count=count of=/path/to/isoimage.iso

Taking an image of a disk, skipping errors:
      pv -EE /dev/sda > disk-image.img

Writing an image back to a disk:
      pv disk-image.img > /dev/sda

Zeroing a disk:
      pv < /dev/zero > /dev/sda

cat /dev/sr0 >image.iso
cat </dev/sr0 >image.iso
tee </dev/sr0 >image.iso
dd </dev/sr0 >image.iso
dd if=/dev/cdrom of=image.iso
pv </dev/sr0 >image.iso
cp /dev/sr0 image.iso
tail -c +1 /dev/sr0 >image.iso