preinst is in screen 4.3.1-2build1.
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 12 | #!/bin/sh
set -e
if [ "$1" = upgrade ]; then
if dpkg --compare-versions "$2" lt-nl 4.0.3-7 && \
dpkg --compare-versions "$2" gt 4.0.3-3; then
if ! test -L /tmp/.screen && test -d /tmp/.screen && test -n "`find /tmp/.screen -type p 2>/dev/null`"; then
ln -s /tmp/.screen /var/run/screen
fi
fi
fi
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