You should have on and off valve behind the dryer where the dryer gas line connects to. That should shut off the gas as long as it’s in working order?
After you turn the valve off and cap off the open fitting that you unscrewed the dryer gas line I would also check the valve for leaks using the soapy water as suggested and any exposed connections. ( naturally you want to hold the pipe while unscrewing the dryer line so you don’t disturb other joints up stream). When you turn off or on something that hasn’t been rotated for long time it may leak after being tampered with. If that happens you will have to probably have plumper if you don’t know how to turn off the gas at the meter. It’s no difference than living up north when the power goes out and you have to use alternative propane heat source, check all the connections you made for leaks. If you have any doubt of you’re ability preforming this CALL plumber.
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