No other way than to get access to the broken pipe,cut it well and straight , then use a coupling that can be pushed into and glued into - if PVC there is no problem but to put in the length and fix with the shower thread. But If Metal then if threading is impossible then use a wrench to remove off the broken from the bend end , put in a new piece of the same length with the thread for the shower fitting.
There is no other way temporarily but to plug this if you do not have the equipment.
Good luck
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