prerm is in bladerf-firmware-fx3 0.2016.01~rc1-3.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | #!/bin/sh
set -e
IMGFILE=/usr/share/Nuand/bladeRF/bladeRF_fw.img
if [ "$1" = "remove" -o "$1" = "purge" ]; then
echo "Deleting downloaded firmware: $IMGFILE"
rm -f $IMGFILE
fi
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