But, bash has this... (job control)

: root@llana fred #; dd if=/dev/sda of=/dev/null

^Z

[1]+ Stopped dd

if=/dev/sda of=/dev/null

: root@llana fred #; bg

[1]+ dd if=/dev/sda of=/dev/null &

: root@llana fred #; jobs

[1]+ Running dd

if=/dev/sda of=/dev/null &