preinst is in itk3 3.4.2-1.
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 | #!/bin/sh
set -e
# Automatically added by dh_installdeb
dpkg-maintscript-helper symlink_to_dir /usr/share/doc/itk3 /usr/share/doc/itcl3 3.3-5.1~ -- "$@"
# End automatically added section
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