/sbin/ibmspdown is in ibmasm-utils 3.0-1ubuntu12.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | #!/bin/bash
/usr/bin/killall /sbin/ibmsphalt
/bin/umount /var/lib/ibmasm 2>/dev/null
/sbin/modprobe -q -r ibmasm
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