preinst is in g++-8-arm-linux-gnueabi 8-20180414-1ubuntu2cross1.
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 10 11 | #!/bin/sh
set -e
if [ "$1" = "upgrade" ] || [ "$1" = "configure" ]; then
update-alternatives --quiet --remove arm-linux-gnueabi-g++ /usr/bin/arm-linux-gnueabi-g++-8
fi
exit 0
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