preinst is in spawn-fcgi 1.6.4-2.
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 -e
if test "$1" = "upgrade"; then
update-alternatives --remove spawn-fcgi /usr/bin/spawn-fcgi.standalone
fi
exit 0
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