/usr/share/radare/gradare/Debugger/SetRegister is in radare-gtk 1:1.5.2-6.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 | #!/bin/sh
echo "q!reg* > /tmp/.regs"
echo ".!rsc SetRegister"
echo "V"
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