Temp redneck fix: vicegrips, if it broke inside the car.

Might have enough slack to splice the cable back together with a crimp-style ferrule (Lowe's, Home Depot), if it broke in the middle somewhere, as amc49 eludes to above.
I had an 87 Topaz that the hood-release cable broke on mid-way through the engine bay. I pulled the cable out of the sheath, made a loop that dropped right below the bumper, wrapped it in electrical tape, and pretended it was a race car for the remainder of the time I owned it. Lol.
