preinst is in rxvt-unicode-lite 9.21-1build1.
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 | #!/bin/sh
set -e
if [ "$1" = upgrade ]; then
# clean up after old versions, unless the admin chose urxvtcd
if ! update-alternatives --query x-terminal-emulator | grep -q \
'^Value: /usr/bin/urxvtcd$'; then
update-alternatives --remove x-terminal-emulator /usr/bin/urxvtcd
fi
fi
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