http://qs321.pair.com?node_id=492323


in reply to Probably an easy one - store command in variable.

This should do what you're looking for:
eval $command;

By the way, eval traps otherwise fatal errors, so pay attention to what's happening with the code being eval'd.

Update:Thanks to everyone for pointing out the scoping and performance problems with eval. It just 'popped in there' like the Stay-Puffed marshmallow man.