Display Images Whilst Running Other Functions

[raguff]

Hi,

So I'm teaching myself some scripting to try and create a fairly simple photobooth type affair... I've got gphoto2 playing fairly nicely with my canon, and imagemagick taking that output and rearranging it to a vertical format...

EDIT:
*smacks forehead*

Fairly simple to do what I needed initially:

feh -FZ -D 1 --cycle-once $COUNTDOWN & sleep 2 &
feh -FZ -D 20 --cycle-once $SMILE

This shows a countdown from 5 to 1 in images and $SMILE is big that says 'smile'

So my question is thus... (fairly basic but I can't get my head round the use of & and sleep in this context) what's the best way to call my gphoto instructions (or a script with them in) mid way through the above code?!

'feh code'
sleep 5
'gphoto code'

this kind of thing seems like the way, but the'sleep 5' and 'gphoto code' doesn't start until feh is finished in this case?? It's late and I must be missing something obvious - but any pointers appreciated.
Thanks!

[cfajohnson]

'feh code' &
sleep 5
'gphoto code'
wait